Patent US5097227A successfully refreshed from Google Patents.
US5097227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oscillator position sensor
Assignee: Texas Instruments Inc
•
Filing: 1990-10-09
•
Granted: 1992-03-17
•
Expires: 2010-10-09
Abstract
Abstract A microwave oscillator circuit having an antenna, wherein the effective reactive impedance of the oscillator circuit is altered by the movement of a reactive impedance changing element past the antenna to cause change of the oscillation condition of the oscillator. A change in oscillation condition is sensed and sent to a utilization device to determine speed and/or position. The utilization device can be a computer which receives a signal from a wheel speed determining system, wherefrom a signal is sent back to a braking system for the wheel to control braking thereof. This can be accomplished individually for each of the four wheels to provide an anti-locking braking system.
Inventors
- 👤 Han-Tzong Yuan
- 👤 Hua Q. Tserng
- 👤 Hung Y. Yee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:50
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/95; H03K17/952; H03K17/9525; H03B; H03B5/00; H03B5/18; H03B5/1841; H03B5/1847; H03B5/1852; H03B9/00; H03B9/12; H03B2009/126; H03B9/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
179 words
A sensing system comprising: (a) an oscillator circuit normally in one of an oscillating or non-oscillating mode, said oscillator circuit including a feedback circuit including a reactive impedance in the form of a sensing antenna for sensing an external condition, and (b) output means coupled to said oscillator circuit and responsive to a predetermined change in the reactive impedance of said antenna which changes the oscillation mode of operation of said oscillator to provide an indication of said change of oscillation mode; (c) wherein said oscillator circuit includes a FET having source, drain and gate electrodes, a serial circuit formed of said antenna, a matching circuit and an inductor being connected to said drain, a feedback inductor coupled between a source of reference voltage and said gate, an inductor serially coupled between said source electrode and a parallel connected resistor-capacitor circuit, said resistor-capacitor circuit also being coupled to said source of reference voltage, two resistors in series being coupled between said drain and the junction of said inductor and said resistor-capacitor circuit, said output means coupled to said drain.
Claim 2
Dependent Claim
179 words
A sensing system comprising: (a) an oscillator circuit normally in one of an oscillating or non-oscillating mode, said oscillator circuit including a feedback circuit including a reactive impedance in the form of a sensing antenna for sensing an external condition, and (b) output means coupled to said oscillator circuit and responsive to a predetermined change in the reactive impedance of said antenna which changes the oscillation mode of operation of said oscillator to provide an indication of said change of oscillation mode; (c) wherein said oscillator circuit includes a FET having source, drain and gate electrodes, a serial circuit formed of said antenna, a matching circuit and an inductor being connected to said drain, a feedback inductor coupled between a source of reference voltage and said gate, an inductor serially coupled between said source electrode and a parallel connected resistor-capacitor circuit, said resistor-capacitor circuit also being coupled to said source of reference voltage, two resistors in series being coupled between said drain and the junction of said inductor and said resistor-capacitor circuit, said output means coupled to said drain.
Claim 3
Dependent Claim
55 words
A sensing system as set forth in claim 1, further including means spaced within up to about 1 wavelength of the normal oscillating frequency of said oscillator circuit from said antenna and movable past said antenna to cause said change in the reactive impedance of said antenna, said oscillator circuit being biased in class B.
Claim 4
Dependent Claim
179 words
A sensing system comprising: (a) an oscillator circuit normally in one of an oscillating or non-oscillating mode, said oscillator circuit including a feedback circuit including a reactive impedance in the form of a sensing antenna for sensing an external condition, and (b) output means coupled to said oscillator circuit and responsive to a predetermined change in the reactive impedance of said antenna which changes the oscillation mode of operation of said oscillator to provide an indication of said change of oscillation mode; (c) wherein said oscillator circuit includes a bipolar transistor having emitter, collector and base electrodes, a serial circuit formed of said antenna, a matching circuit and an inductor being connected to said collector, a feedback inductor coupled between a source of reference voltage and said emitter, an inductor serially coupled between said base and a parallel connected resistor-capacitor circuit, said resistor-capacitor circuit also being coupled to said source of reference voltage, two resistors in series being coupled between said collector and the junction of said inductor and said resistor-capacitor circuit, said output means coupled to said collector.
Claim 5
Dependent Claim
179 words
A sensing system comprising: (a) an oscillator circuit normally in one of an oscillating or non-oscillating mode, said oscillator circuit including a feedback circuit including a reactive impedance in the form of a sensing antenna for sensing an external condition, and (b) output means coupled to said oscillator circuit and responsive to a predetermined change in the reactive impedance of said antenna which changes the oscillation mode of operation of said oscillator to provide an indication of said change of oscillation mode; (c) wherein said oscillator circuit includes a bipolar transistor having emitter, collector and base electrodes, a serial circuit formed of said antenna, a matching circuit and an inductor being connected to said collector, a feedback inductor coupled between a source of reference voltage and said emitter, an inductor serially coupled between said base and a parallel connected resistor-capacitor circuit, said resistor-capacitor circuit also being coupled to said source of reference voltage, two resistors in series being coupled between said collector and the junction of said inductor and said resistor-capacitor circuit, said output means coupled to said collector.
Claim 6
Dependent Claim
55 words
A sensing system as set forth in claim 3, further including means spaced within up to about 1 wavelength of the normal oscillating frequency of said oscillator circuit from said antenna and movable past said antenna to cause said change in the reactive impedance of said antenna, said oscillator circuit being biased in class B.
Claim 7
Dependent Claim
141 words
A sensing system comprising: (a) an oscillator circuit normally in one of an oscillating or non-oscillating mode, said oscillator circuit including a feedback circuit including a reactive impedance in the form of a sensing antenna for sensing an external condition, and (b) output means coupled to said oscillator circuit and responsive to a predetermined change in the reactive impedance of said antenna which changes the oscillation mode of operation of said oscillator to provide an indication of said change of oscillation mode; (c) wherein said oscillator circuit includes an IMPATT diode having an anode and a cathode, a serial circuit formed of said antenna, a matching circuit and an inductor being connected to said cathode, said anode coupled to a source of reference voltage and said cathode being coupled to a source of power, said output means coupled to said cathode.
Claim 8
Dependent Claim
141 words
A sensing system comprising: (a) an oscillator circuit normally in one of an oscillating or non-oscillating mode, said oscillator circuit including a feedback circuit including a reactive impedance in the form of a sensing antenna for sensing an external condition, and (b) output means coupled to said oscillator circuit and responsive to a predetermined change in the reactive impedance of said antenna which changes the oscillation mode of operation of said oscillator to provide an indication of said change of oscillation mode; (c) wherein said oscillator circuit includes an IMPATT diode having an anode and a cathode, a serial circuit formed of said antenna, a matching circuit and an inductor being connected to said cathode, said anode coupled to a source of reference voltage and said cathode being coupled to a source of power, said output means coupled to said cathode.
Claim 9
Dependent Claim
55 words
A sensing system as set forth in claim 5, further including means spaced within up to about 1 wavelength of the normal oscillating frequency of said oscillator circuit from said antenna and movable past said antenna to cause said change in the reactive impedance of said antenna, said oscillator circuit being biased in class B.
Claim 10
Dependent Claim
196 words
A control system which comprises: (a) a sensing system comprising: (b) an oscillator circuit normally in one of an oscillating or non-oscillating mode, said oscillator circuit including a feedback circuit including a reactive impedance in the form of a sensing antenna for sensing an external condition, (c) output means coupled to said oscillator circuit and responsive to a predetermined change in the reactive impedance of said antenna which changes the oscillation mode of operation of said oscillator to provide an indication of said change of oscillation mode, and (d) means responsive to said indication to provide a control function; (e) wherein said oscillator circuit includes a FET having source, drain and gate electrodes, a serial circuit formed of said antenna, a matching circuit and an indicator being connected to said drain, a feedback inductor coupled between a source of reference voltage and said gate, an inductor serially coupled between said source electrode and a parallel connected resistor-capacitor circuit, said resistor-capacitor circuit also being coupled to said source of reference voltage, two resistors in series being coupled between said drain and the junction of said inductor and said resistor-capacitor circuit, said output means coupled to said drain.
Claim 11
Dependent Claim
196 words
A control system which comprises: (a) a sensing system comprising: (b) an oscillator circuit normally in one of an oscillating or non-oscillating mode, said oscillator circuit including a feedback circuit including a reactive impedance in the form of a sensing antenna for sensing an external condition, (c) output means coupled to said oscillator circuit and responsive to a predetermined change in the reactive impedance of said antenna which changes the oscillation mode of operation of said oscillator to provide an indication of said change of oscillation mode, and (d) means responsive to said indication to provide a control function; (e) wherein said oscillator circuit includes a FET having source, drain and gate electrodes, a serial circuit formed of said antenna, a matching circuit and an indicator being connected to said drain, a feedback inductor coupled between a source of reference voltage and said gate, an inductor serially coupled between said source electrode and a parallel connected resistor-capacitor circuit, said resistor-capacitor circuit also being coupled to said source of reference voltage, two resistors in series being coupled between said drain and the junction of said inductor and said resistor-capacitor circuit, said output means coupled to said drain.
Claim 12
Dependent Claim
55 words
A control system as set forth in claim 7, further including means spaced within up to about 1 wavelength of the normal oscillating frequency of said oscillator circuit from said antenna and movable past said antenna to cause said change in the reactive impedance of said antenna, said oscillator circuit being biased in class B.
Claim 13
Dependent Claim
196 words
A control system which comprises: (a) a sensing system comprising: (b) an oscillator circuit normally in one of an oscillating or non-oscillating mode, said oscillator circuit including a feedback circuit including a reactive impedance in the form of a sensing antenna for sensing an external condition, (c) output means coupled to said oscillator circuit and responsive to a predetermined change in the reactive impedance of said antenna which changes the oscillation mode of operation of said oscillator to provide an indication of said change of oscillation mode, and (d) means responsive to said indication to provide a control function; (e) wherein said oscillator circuit includes a bipolar transistor having emitter, collector and base electrodes, a serial circuit formed of said antenna, a matching circuit and an inductor being connected to said collector, a feedback inductor coupled between a source of reference voltage and said emitter, an inductor serially coupled between said base and a parallel connected resistor-capacitor circuit, said resistor-capacitor circuit also being coupled to said source of reference voltage, two resistors in series being coupled between said collector and the junction of said inductor and said resistor-capacitor circuit, said output means coupled to said collector.
Claim 14
Dependent Claim
196 words
A control system which comprises: (a) a sensing system comprising: (b) an oscillator circuit normally in one of an oscillating or non-oscillating mode, said oscillator circuit including a feedback circuit including a reactive impedance in the form of a sensing antenna for sensing an external condition, (c) output means coupled to said oscillator circuit and responsive to a predetermined change in the reactive impedance of said antenna which changes the oscillation mode of operation of said oscillator to provide an indication of said change of oscillation mode, and (d) means responsive to said indication to provide a control function; (e) wherein said oscillator circuit includes a bipolar transistor having emitter, collector and base electrodes, a serial circuit formed of said antenna, a matching circuit and an inductor being connected to said collector, a feedback inductor coupled between a source of reference voltage and said emitter, an inductor serially coupled between said base and a parallel connected resistor-capacitor circuit, said resistor-capacitor circuit also being coupled to said source of reference voltage, two resistors in series being coupled between said collector and the junction of said inductor and said resistor-capacitor circuit, said output means coupled to said collector.
Claim 15
Dependent Claim
55 words
A control system as set forth in claim 9, further including means spaced within up to about 1 wavelength of the normal oscillating frequency of said oscillator circuit from said antenna and movable past said antenna to cause said change in the reactive impedance of said antenna, said oscillator circuit being biased in class B.
Claim 16
Dependent Claim
158 words
A control system which comprises: (a) a sensing system comprising: (b) an oscillator circuit normally in one of an oscillating or non-oscillating mode, said oscillator circuit including a feedback circuit including a reactive impedance in the form of a sensing antenna for sensing an external condition, (c) output means coupled to said oscillator circuit and responsive to a predetermined change in the reactive impedance of said antenna which changes the oscillation mode of operation of said oscillator to provide an indication of said change of oscillation mode, and (d) means responsive to said indication to provide a control function; (e) wherein said oscillator circuit includes an IMPATT diode having an anode and a cathode, a serial circuit formed of said antenna, a matching circuit and an inductor being connected to said cathode, said anode coupled to a source of reference voltage and said cathode being coupled to a source of power, said output means coupled to said cathode.
Claim 17
Dependent Claim
158 words
A control system which comprises: (a) a sensing system comprising: (b) an oscillator circuit normally in one of an oscillating or non-oscillating mode, said oscillator circuit including a feedback circuit including a reactive impedance in the form of a sensing antenna for sensing an external condition, (c) output means coupled to said oscillator circuit and responsive to a predetermined change in the reactive impedance of said antenna which changes the oscillation mode of operation of said oscillator to provide an indication of said change of oscillation mode, and (d) means responsive to said indication to provide a control function; (e) wherein said oscillator circuit includes an IMPATT diode having an anode and a cathode, a serial circuit formed of said antenna, a matching circuit and an inductor being connected to said cathode, said anode coupled to a source of reference voltage and said cathode being coupled to a source of power, said output means coupled to said cathode.
Claim 18
Dependent Claim
55 words
A control system as set forth in claim 11, further including means spaced within up to about 1 wavelength of the normal oscillating frequency of said oscillator circuit from said antenna and movable past said antenna to cause said change in the reactive impedance of said antenna, said oscillator circuit being biased in class B.
References Cited (Backward Citations)
US4173755A
Cited
US4475089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-17 | 1995-09-16 | 1996-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-17 | 1999-09-16 | 2000-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-17 | 2003-09-16 | 2004-03-17 | $7700.00 | Window Closed / Lapsed |