US5087893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
RF driven gate bias
Assignee: Motorola Solutions Inc
•
Filing: 1989-12-18
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Granted: 1992-02-11
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Expires: 2009-12-18
Abstract
Abstract A circuit for providing DC bias voltage to an RF power amplifier transistor where the DC bias voltage is derived from the RF input signal.
Inventors
- 👤 Michael W. Petersen
- 👤 Clark D. Fischbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:30
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
75 words
A circuit for providing bias voltage to at least one amplifier transistor having an RF input signal, the circuit comprising: RF power divider means for providing a sample of the RF input signal; rectifier means for converting the sample into a DC voltage; regulator means responsive to the rectifier means for providing the bias voltage and limiting amplitude to ensure a relatively constant bias voltage over a relatively wide range of RF input signal amplitudes.
Claim 2
Dependent Claim
75 words
A circuit for providing bias voltage to at least one amplifier transistor having an RF input signal, the circuit comprising: RF power divider means for providing a sample of the RF input signal; rectifier means for converting the sample into a DC voltage; regulator means responsive to the rectifier means for providing the bias voltage and limiting amplitude to ensure a relatively constant bias voltage over a relatively wide range of RF input signal amplitudes.
Claim 3
Dependent Claim
17 words
The circuit in accordance with claim 1, wherein said at least one amplifier transistor is a MOSFET.
Claim 4
Dependent Claim
15 words
The circuit in accordance with claim 2, wherein the MOSFET is an enhancement mode MOSFET.
Claim 5
Dependent Claim
19 words
The circuit in accordance with claim 1, wherein the RF power divider means comprises a tapped microstrip transmission line.
Claim 6
Independent Claim
66 words
A method for providing bias voltage to at least one amplifier transistor having an RF input signal, the method comprising: (a) providing a sample of the RF input signal; (b) converting the sample into a DC voltage; and (c) regulating the DC voltage to provide the bias voltage and to ensure a relatively constant bias voltage over a relatively wide range of RF input signal amplitudes.
Claim 7
Independent Claim
66 words
A method for providing bias voltage to at least one amplifier transistor having an RF input signal, the method comprising: (a) providing a sample of the RF input signal; (b) converting the sample into a DC voltage; and (c) regulating the DC voltage to provide the bias voltage and to ensure a relatively constant bias voltage over a relatively wide range of RF input signal amplitudes.
Claim 8
Dependent Claim
80 words
For a MOSFET RF power amplifier stage having an RF input signal, a method for providing an RF driven gate bias voltage derived from the RF input signal, the method comprising: (a) sampling the RF input signal to provide a sampled signal; (b) rectifying the sampled signal to provide a pulsating DC voltage; (c) filtering the pulsating DC voltage to provide a filtered DC voltage; and (d) regulating the filtered DC voltage to provide the RF driven gate bias voltage.
Claim 9
Dependent Claim
80 words
For a MOSFET RF power amplifier stage having an RF input signal, a method for providing an RF driven gate bias voltage derived from the RF input signal, the method comprising: (a) sampling the RF input signal to provide a sampled signal; (b) rectifying the sampled signal to provide a pulsating DC voltage; (c) filtering the pulsating DC voltage to provide a filtered DC voltage; and (d) regulating the filtered DC voltage to provide the RF driven gate bias voltage.
References Cited (Backward Citations)
GB1568513A
Cited
US4465980A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |