US5263197A
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Dual port oscillator for two-stage direct conversion receiver
Assignee: Matsushita Communication Industrial Corp
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Filing: 1991-09-20
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Granted: 1993-11-16
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Expires: 2011-09-20
Abstract
Abstract A two-stage direct conversion receiver. A first mixer (13) converts the incoming signal to an intermediate frequency (IF) signal. A second mixer (16) converts the IF signal to a baseband signal. A detector (17), receiver logic circuit (18), and alerting device circuit (19) act upon the baseband output signal. A two port oscillator (14) provides a fundamental frequency output (FO) and a tripled output frequency (3 FO). The tripled output frequency is again tripled (9 FO) by a frequency multiplier (15) and is provided as a mixing signal to the first mixer (13). The fundamental frequency output is provided to a phase locked loop (20, 21, 22). The output frequency (FV) of the phase locked loop is doubled (2 FV) by a frequency multiplier (23) and provided to a phase shift circuit (24). The output of the phase shift circuit (24) is provided as the second mixing signal to the second mixer (16). The phase locked loop comprises a phase locked loop controller (20), a phase locked loop filter (21), and a voltage controlled oscillator (22). The main oscillator (14) is configured as a crystal controlled Colpitts oscillator, which has an emitter resonant circuit selected to produce oscillation at the fundamental frequency, and a collector resonant circuit selected to extract the third harmonic of the fundamental oscillation frequency. A single active device can therefore provide both the fundamental frequency and the third harmonic frequency. Calibration of the receiver is effected by simply tuning the oscillator (14) to produce a baseband output signal at the output of the second mixer (16). Single step calibration is therefore effected because the voltage controlled oscillator (22) is locked to the main oscillator (14).
Inventors
- 👤 Yoshiharu Manjo
- 👤 Charles R. McMurray
- 👤 Tadashi Ohga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:31
CPC Classifications
H; H03; H03J; H03J5/00; H03J5/02; H03J5/0245; H03J5/0272; H03B; H03B25/00; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/26; H04B1/28; H04B1/30; H03B19/00; H03B19/06; H03B19/14; H03B2201/00; H03B2201/01; H03B2201/011; H03B2201/02; H03B2201/0208; H03B5/00; H03B5/30; H03B5/32; H03B5/36; H03B5/362; H03D; H03D7/00; H03D7/16
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
139 words
An oscillator, comprising: an amplifying device having an input terminal, a first output terminal, and a second output terminal; a crystal, having a predetermined characteristic frequency, functionally connected to said input terminal; a first resonant circuit, having a resonant frequency selected to cause said amplifying device to oscillate only at approximately said predetermined characteristic frequency, and functionally connected to said first output terminal; and a second resonant circuit, having a resonant frequency being approximately N times said predetermined characteristic frequency, and being functionally connected to said second output terminal, N being an integer greater than one; wherein said first output terminal primarily provides a first output signal having a frequency approximately the same as said predetermined characteristic frequency, and said second output terminal primarily provides a second output signal having a frequency approximately N times said predetermined characteristic frequency.
Claim 2
Dependent Claim
139 words
An oscillator, comprising: an amplifying device having an input terminal, a first output terminal, and a second output terminal; a crystal, having a predetermined characteristic frequency, functionally connected to said input terminal; a first resonant circuit, having a resonant frequency selected to cause said amplifying device to oscillate only at approximately said predetermined characteristic frequency, and functionally connected to said first output terminal; and a second resonant circuit, having a resonant frequency being approximately N times said predetermined characteristic frequency, and being functionally connected to said second output terminal, N being an integer greater than one; wherein said first output terminal primarily provides a first output signal having a frequency approximately the same as said predetermined characteristic frequency, and said second output terminal primarily provides a second output signal having a frequency approximately N times said predetermined characteristic frequency.
Claim 3
Dependent Claim
12 words
The oscillator of claim 1 wherein said amplifying device is a transistor.
Claim 4
Dependent Claim
165 words
An oscillator, comprising: an amplifying device having an input terminal, a first output terminal, and a second output terminal, wherein said amplifying device is a transistor having a base for said input terminal, an emitter for said first output terminal, and a collector for said second output terminal; a crystal, having a predetermined characteristic frequency, functionally connected to said input terminal; a first resonant circuit, having a resonant frequency selected to cause said amplifying device to oscillate at approximately said predetermined characteristic frequency, and functionally connected to said first output terminal; and a second resonant circuit, having a resonant frequency being approximately N times said predetermined characteristic frequency, and being functionally connected to said second output terminal, N being an integer greater than one; wherein said first output terminal provides a first output signal having a frequency approximately the same as said predetermined characteristic frequency, and said second output terminal provides a second output signal having a frequency approximately N times said predetermined characteristic frequency.
Claim 5
Dependent Claim
165 words
An oscillator, comprising: an amplifying device having an input terminal, a first output terminal, and a second output terminal, wherein said amplifying device is a transistor having a base for said input terminal, an emitter for said first output terminal, and a collector for said second output terminal; a crystal, having a predetermined characteristic frequency, functionally connected to said input terminal; a first resonant circuit, having a resonant frequency selected to cause said amplifying device to oscillate at approximately said predetermined characteristic frequency, and functionally connected to said first output terminal; and a second resonant circuit, having a resonant frequency being approximately N times said predetermined characteristic frequency, and being functionally connected to said second output terminal, N being an integer greater than one; wherein said first output terminal provides a first output signal having a frequency approximately the same as said predetermined characteristic frequency, and said second output terminal provides a second output signal having a frequency approximately N times said predetermined characteristic frequency.
Claim 6
Dependent Claim
100 words
A direct conversion receiver, comprising: a first mixer responsive to an input signal and a first mixing signal for providing an intermediate frequency (IF) output signal; a first oscillator for providing a first oscillator signal to said first mixer as said first mixing signal; a second mixer responsive to said IF output signal and a second mixing signal for providing a baseband output signal; a second oscillator for providing a second oscillator signal to said second mixer as said second mixing signal; and locking means for locking said second oscillator signal in a predetermined relationship to said first oscillator signal.
Claim 7
Dependent Claim
100 words
A direct conversion receiver, comprising: a first mixer responsive to an input signal and a first mixing signal for providing an intermediate frequency (IF) output signal; a first oscillator for providing a first oscillator signal to said first mixer as said first mixing signal; a second mixer responsive to said IF output signal and a second mixing signal for providing a baseband output signal; a second oscillator for providing a second oscillator signal to said second mixer as said second mixing signal; and locking means for locking said second oscillator signal in a predetermined relationship to said first oscillator signal.
Claim 8
Dependent Claim
47 words
The direct conversion receiver of claim 4 and further comprising: frequency multiplying means connected between said first oscillator and said first mixer for providing said first mixing signal by multiplying the frequency of said first oscillator signal by M, where M is an integer greater than one.
Claim 9
Dependent Claim
127 words
A direct conversion receiver, comprising: a first mixer responsive to an input signal and a first mixing signal for providing an intermediate frequency (IF) output signal; a first oscillator for providing a first oscillator signal to said first mixer as said first mixing signal; a second mixer responsive to said IF output signal and a second mixing signal for providing a baseband output signal; a second oscillator for providing a second oscillator signal to said second mixer as said second mixing signal; and locking means for locking said second oscillator signal in a predetermined relationship to said first oscillator signal; wherein said first oscillator has a first port for providing a reference signal to said locking means and a second port for providing said first oscillator signal.
Claim 10
Dependent Claim
127 words
A direct conversion receiver, comprising: a first mixer responsive to an input signal and a first mixing signal for providing an intermediate frequency (IF) output signal; a first oscillator for providing a first oscillator signal to said first mixer as said first mixing signal; a second mixer responsive to said IF output signal and a second mixing signal for providing a baseband output signal; a second oscillator for providing a second oscillator signal to said second mixer as said second mixing signal; and locking means for locking said second oscillator signal in a predetermined relationship to said first oscillator signal; wherein said first oscillator has a first port for providing a reference signal to said locking means and a second port for providing said first oscillator signal.
Claim 11
Dependent Claim
148 words
A direct conversion receiver, comprising: a first mixer responsive to an input signal and a first mixing signal for providing an intermediate frequency (IF) output signal; a first oscillator for providing a first oscillator signal to said first mixer as said first mixing signal; a second mixer responsive to said IF output signal and a second mixing signal for providing a baseband output signal; a second oscillator for providing a second oscillator signal to said second mixer as said second mixing signal; and locking means for locking said second oscillator signal in a predetermined relationship to said first oscillator signal; wherein said first oscillator has a first port for providing a reference signal having a first frequency to said locking means, and a second port for providing said first oscillator signal having a frequency of N times said first frequency, where N is an integer greater than 1.
Claim 12
Dependent Claim
148 words
A direct conversion receiver, comprising: a first mixer responsive to an input signal and a first mixing signal for providing an intermediate frequency (IF) output signal; a first oscillator for providing a first oscillator signal to said first mixer as said first mixing signal; a second mixer responsive to said IF output signal and a second mixing signal for providing a baseband output signal; a second oscillator for providing a second oscillator signal to said second mixer as said second mixing signal; and locking means for locking said second oscillator signal in a predetermined relationship to said first oscillator signal; wherein said first oscillator has a first port for providing a reference signal having a first frequency to said locking means, and a second port for providing said first oscillator signal having a frequency of N times said first frequency, where N is an integer greater than 1.
Claim 13
Dependent Claim
119 words
The direct conversion receiver of claim 7 wherein said first oscillator comprises: an amplifying device having an input terminal, a first output terminal, and a second output terminal; a crystal, having a predetermined characteristic frequency, functionally connected to said input terminal; a first resonant circuit, having a resonant frequency selected to cause said amplifying device to oscillate at said predetermined characteristic frequency, functionally connected to said first output terminal; and a second resonant circuit, having a resonant frequency being approximately N times said predetermined characteristic frequency, functionally to said second output terminal, N being an integer greater than one; wherein said first output terminal functions as said first port and said second output terminal functions as said second port.
Claim 14
Dependent Claim
14 words
The direct conversion receiver of claim 8 wherein said amplifying device is a transistor.
Claim 15
Dependent Claim
32 words
The direct conversion receiver of claim 9 wherein said transistor has a base for said input terminal, an emitter for said first output terminal, and a collector for said second output terminal.
Claim 16
Dependent Claim
17 words
The direct conversion receiver of claim 4 wherein said locking means comprises a phase locked loop controller.
Claim 17
Dependent Claim
16 words
The direct conversion receiver of claim 11 wherein said second oscillator comprises a voltage controlled oscillator.
Claim 18
Dependent Claim
45 words
The direct conversion receiver of claim 4 and further comprising: frequency multiplying means connected between said second oscillator and second mixer for providing said second mixing signal by multiplying the frequency of said second oscillator by M, where M is an integer greater than 1.
Claim 19
Dependent Claim
161 words
A precision, multifrequency oscillator circuit, comprising: a crystal; a first oscillator, functionally connected to said crystal, for providing a first output signal, said first output signal having a first frequency, said first frequency being determined primarily by said crystal; a second oscillator, responsive to a frequency control signal, for providing a second output signal, said second output signal having a second frequency, said second frequency being determined by said frequency control signal and being a frequency other than an integer multiple or an integer submultiple of said first frequency; and a controller functionally connected to said first oscillator and said second oscillator for providing said frequency control signal, said frequency control signal being responsive to a relationship between a first scaled signal and a second scaled signal, said first scaled signal having a frequency equal to a first integer submultiple of said first frequency, said second scaled signal having a frequency equal to a second integer submultiple of said second frequency.
Claim 20
Dependent Claim
161 words
A precision, multifrequency oscillator circuit, comprising: a crystal; a first oscillator, functionally connected to said crystal, for providing a first output signal, said first output signal having a first frequency, said first frequency being determined primarily by said crystal; a second oscillator, responsive to a frequency control signal, for providing a second output signal, said second output signal having a second frequency, said second frequency being determined by said frequency control signal and being a frequency other than an integer multiple or an integer submultiple of said first frequency; and a controller functionally connected to said first oscillator and said second oscillator for providing said frequency control signal, said frequency control signal being responsive to a relationship between a first scaled signal and a second scaled signal, said first scaled signal having a frequency equal to a first integer submultiple of said first frequency, said second scaled signal having a frequency equal to a second integer submultiple of said second frequency.
Claim 21
Dependent Claim
15 words
The oscillator circuit of claim 14 wherein said second oscillator is a voltage controlled oscillator.
Claim 22
Dependent Claim
20 words
The oscillator circuit of claim 14 wherein said controller and said second oscillator are embodied in a phase locked loop.
Claim 23
Dependent Claim
28 words
The oscillator circuit of claim 14 and further comprising a lowpass filter connected between said controller and said second oscillator for low pass filtering said frequency control signal.
Claim 24
Dependent Claim
17 words
The oscillator circuit of claim 14 and further comprising tuning means for precisely setting said first frequency.
Claim 25
Dependent Claim
14 words
The oscillator circuit of claim 18 wherein said tuning means comprises a variable capacitor.
Claim 26
Dependent Claim
16 words
The oscillator circuit of claim 14 wherein said first oscillator is configured as a Colpitts 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) | 1996-11-15 | 1997-05-17 | 1997-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-15 | 2001-05-17 | 2001-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-15 | 2005-05-17 | 2005-11-16 | $7700.00 | Window Closed / Lapsed |