US5146613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low power uhf data transceiver
Assignee: Delco Electronics LLC
•
Filing: 1990-11-16
•
Granted: 1992-09-08
•
Expires: 2010-11-16
Abstract
Abstract A transceiver has an RF oscillator stage shared by the receiving and transmitting modes. The RF oscillator has a feedback loop incorporating a SAW delay line. A switching arrangement selectively couples the antenna to the transmission circuit and optionally couples the antenna to the receiving circuit. The RF oscillator stage is isolated from switching perturbations by small capacitors at the input and at the output of the oscillator.
Inventors
- 👤 Fred J. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:42
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/44; H04B1/06; H04B1/16; H04B1/30; H04B1/403
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
115 words
A low power transmitter/receiver having a receiving mode and a transmitting mode comprising; RF oscillator means including an amplifier having an input and an output and further including a feedback circuit containing a surface acoustic wave device coupling said input and said output to cause RF oscillations, control means coupled to said transmitter/receiver for switching said transmitter/receiver between said transmitting and said receiving modes, transmission means coupled to said output and effective during said transmitting mode for transmitting the RF oscillations, and input means effective during said receiving mode for coupling a modulated RF signal to said oscillator input, and low pass filter means coupled to said output of said oscillator to recover the modulation.
Claim 2
Dependent Claim
115 words
A low power transmitter/receiver having a receiving mode and a transmitting mode comprising; RF oscillator means including an amplifier having an input and an output and further including a feedback circuit containing a surface acoustic wave device coupling said input and said output to cause RF oscillations, control means coupled to said transmitter/receiver for switching said transmitter/receiver between said transmitting and said receiving modes, transmission means coupled to said output and effective during said transmitting mode for transmitting the RF oscillations, and input means effective during said receiving mode for coupling a modulated RF signal to said oscillator input, and low pass filter means coupled to said output of said oscillator to recover the modulation.
Claim 3
Dependent Claim
48 words
The invention as defined in claim 1 including; data means coupled to the RF oscillator during transmitting mode for modulating the RF oscillations for transmission, a quench oscillator coupled to the RF oscillator during receiving mode for switching the RF oscillator between an oscillating and a non-oscillating condition.
Claim 4
Dependent Claim
51 words
The invention as defined in claim 1 including an antenna, and wherein the control means includes switch means connected to the antenna and to the transmission means and the input means for selectively coupling the transmission means and the input means to the antenna for transmitting mode and receiving mode respectively.
Claim 5
Dependent Claim
36 words
The invention as defined in claim 1 including an antenna, and wherein the control means includes means coupled to the transmission means for coupling the said RF oscillations to the antenna only during the transmitting mode.
Claim 6
Dependent Claim
39 words
The invention as defined in claim 2 wherein the control means includes means for coupling the data means to the RF oscillator during transmitting mode and for coupling the quench oscillator to the RF oscillator during the receiving mode.
Claim 7
Dependent Claim
38 words
The invention as defined in claim 1 including means for isolating the RF oscillator from the effects of switching external of the oscillator circuit comprising high impedance capacitive coupling between the RF oscillator output and the transmission means.
Claim 8
Dependent Claim
38 words
The invention as defined in claim 1 including means for isolating the RF oscillator from the effects of switching external of the oscillator circuit comprising high impedance capacitive coupling between the RF oscillator input and the input means.
Claim 9
Dependent Claim
29 words
The invention as defined in claim 1 including means operable during transmission mode for coupling a data signal to the RF oscillator to modulate the oscillator output for transmission.
Claim 10
Dependent Claim
127 words
A low power data transceiver comprising; an antenna, a transmission buffer, an RF amplifier an RF oscillator having an input and an output and a feedback circuit containing a surface acoustic wave device coupling the input and the output to cause RF oscillations, means for coupling the oscillator output to the transmission buffer to produce a signal for transmission, switch means connected to the transmission buffer for coupling transmit signals to the antenna during transmission mode, means effective during receiving mode for switching the oscillator between an oscillating and an non-oscillating condition, means for coupling the RF amplifier to the oscillator input to modulate the oscillator, and a low pass filter means coupled to said output of said oscillator for detecting oscillation modulation caused by input signals.
Claim 11
Dependent Claim
127 words
A low power data transceiver comprising; an antenna, a transmission buffer, an RF amplifier an RF oscillator having an input and an output and a feedback circuit containing a surface acoustic wave device coupling the input and the output to cause RF oscillations, means for coupling the oscillator output to the transmission buffer to produce a signal for transmission, switch means connected to the transmission buffer for coupling transmit signals to the antenna during transmission mode, means effective during receiving mode for switching the oscillator between an oscillating and an non-oscillating condition, means for coupling the RF amplifier to the oscillator input to modulate the oscillator, and a low pass filter means coupled to said output of said oscillator for detecting oscillation modulation caused by input signals.
Claim 12
Dependent Claim
40 words
The invention as defined in claim 9 wherein the switch means is also connected to the antenna and the RF amplifier for coupling the antenna to the RF amplifier during receiving mode to pass input signals to the RF amplifier.
Claim 13
Dependent Claim
31 words
The invention as defined in claim 9 wherein each of said means for coupling comprises a high impedance coupling to minimize the effect of said switch means on the RF oscillator.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-08 | 1996-03-09 | 1996-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-08 | 2000-03-09 | 2000-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-08 | 2004-03-09 | 2004-09-08 | $7700.00 | Window Closed / Lapsed |