Patent US4136315A successfully refreshed from Google Patents.
US4136315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low and high frequency oscillators having common voltage regulator circuit
Assignee: Trane US Inc
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Filing: 1977-07-27
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Granted: 1979-01-23
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Expires: 1997-07-27
Abstract
Abstract A low frequency modulating signal and a high frequency carrier signal circuit employing a twin-T oscillator having an integrated circuit operational amplifier for producing the modulating signal and an L-C resonant feedback oscillator having a transistor amplifier for producing the carrier signal, and a monitoring shunt regulator for supplying a reference potential to the twin-T oscillator and biasing and operating potentials to the L-C resonant feedback oscillator and for deactivating the L-C resonant feedback oscillator when an increase in resistance occurs in the shunt regulator.
Inventors
- 👤 John J. Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:55
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/20; H03B5/26; B; B61; B61L; B61L1/00; B61L1/18; B61L1/181; B61L1/188; H03B5/08; H03B5/12; H03B5/1206; H03B5/1296; H03C; H03C1/00; H03C1/36
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
79 words
A low and high frequency signal generating circuit comprising, a low frequency oscillating circuit including an operational amplifier having an inverting and noninverting input and an output, a twin-T feedback network coupled between the output and one of the inverting and noninverting inputs, a voltage regulating circuit connected to the other of the inverting and noninverting inputs, and a high frequency oscillating circuit including a resonant feedback transistor amplifier being biased by voltage supplied by said voltage regulating circuit.
Claim 2
Dependent Claim
79 words
A low and high frequency signal generating circuit comprising, a low frequency oscillating circuit including an operational amplifier having an inverting and noninverting input and an output, a twin-T feedback network coupled between the output and one of the inverting and noninverting inputs, a voltage regulating circuit connected to the other of the inverting and noninverting inputs, and a high frequency oscillating circuit including a resonant feedback transistor amplifier being biased by voltage supplied by said voltage regulating circuit.
Claim 3
Dependent Claim
32 words
The low and high frequency signal generating circuit as defined in claim 1, wherein said twin-T network includes a plurality of resistors and capacitors which are imperfectly nulled to a predetermined frequency.
Claim 4
Dependent Claim
26 words
The low and high frequency signal generating circuit as defined in claim 1, wherein said voltage regulating circuit includes a current-limiting resistor and voltage breakdown device.
Claim 5
Dependent Claim
22 words
The low and high frequency signal generating circuit as defined in claim 3, wherein said voltage breakdown device is a Zener diode.
Claim 6
Dependent Claim
28 words
The low and high frequency signal generating circuit as defined in claim 1, wherein the output of said operational amplifier includes a variable resistor and a four-terminal capacitor.
Claim 7
Dependent Claim
29 words
The low and high frequency signal generating circuit as defined in claim 1, wherein said high frequency oscillating circuit is tuned to the resonant frequency by an L-C circuit.
Claim 8
Dependent Claim
32 words
The low and high frequency signal generating circuit as defined in claim 1, wherein said high frequency oscillating circuit includes a tickler coil for providing regenerating feedback signals to said transistor amplifier.
Claim 9
Dependent Claim
45 words
The low and high frequency signal generating circuit as defined in claim 6, wherein the inductor and capacitor of said L-C circuit are coupled as a tank circuit when said voltage regulating circuit is conductive and establishes a low impedance path for said tank circuit.
Claim 10
Dependent Claim
21 words
The low and high frequency signal generating circuit as defined in claim 1, wherein said transistor amplifier includes a PNP transistor.
Claim 11
Dependent Claim
26 words
The low and high frequency signal generating circuit as defined in claim 1, wherein said high frequency oscillating circuit includes an L-C resonant PNP transistor amplifier.
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) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |