WO1998025339B1 - Dynamic biasing circuit for amplifiers - Google Patents
Dynamic biasing circuit for amplifiersInfo
- Publication number
- WO1998025339B1 WO1998025339B1 PCT/US1997/021590 US9721590W WO9825339B1 WO 1998025339 B1 WO1998025339 B1 WO 1998025339B1 US 9721590 W US9721590 W US 9721590W WO 9825339 B1 WO9825339 B1 WO 9825339B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- amplifier
- signal
- biasing circuit
- biasing
- circuit
- Prior art date
Links
- 238000001514 detection method Methods 0.000 claims 5
- 238000005070 sampling Methods 0.000 claims 4
- 239000003990 capacitor Substances 0.000 claims 2
- 230000000875 corresponding Effects 0.000 claims 2
- 230000001276 controlling effect Effects 0.000 claims 1
Abstract
A dynamic biasing circuit monitors an input signal to a selected amplifier and compensates for variances in the amplifier's collector current by adjusting the amount of biasing DC quiescent current as the power amplitude of the input signal increases or decreases, respectively. To this end, the dynamic biasing circuit includes a detector section that detects and averages the input signal power, and a bias regulator that references a DC output signal from the detector section and accordingly adjusts a DC quiescent collector current of a biased amplifier device. The amplifier's collector current may thereby be maintained at a substantially optimum level in order to minimize negative intermodulation performance.
Claims
AMENDED CLAIMS
[received by the International Bureau on 2 June 1998 (02.06.98); original claims 1-11, 15 and 16 amended; original claim 20 cancelled; new claims 21-28 added; remaining claims unchanged (5 pages)]
1. A dynamic biasing circuit for biasing an amplifier , comprising: a sampling circuit electrically coupled to an input of the amplifier; a peal, averaging detection circuit electrically coupled to an output of the sampling circuit; and a biasing regulator electrically coupled between the output of the peak averaging circuit and the input of the amplifier.
2. The biasing circuit of claim 1, wherein the sampling circuit comprises a directional coupler.
3. The biasing circuit of claim 1, wherein the peak averaging detection circuit comprises a diode biased with a DC voltage.
4. The biasing circuit of claim 3, wherein the peak averaging detection circuit comprises one or more capacitors connected in parallel with the biased diode.
5. The biasing circuit of claim 1, further comprising a gain amplifier electrically coupled between an output of the peak averaging detection circuit and an input of the bias regulator.
6. The biasing circuit of claim 5, wherein the gain amplifier is an operational amplifier.
17
7. The biasing circuit of claim 6, further comprising an RC circuit electrically coupled to the output of the operational amplifier.
8, The biasing circuit of claim 5, wherein the gain amplifier is a variable gain amplifier.
9. The biasing circuit of claim S, wherein the bias regulator comprises an inverting operational amplifier,
10. The biasing circuit of claim 9, wherein the bias regulator comprises a pass transistor electrically coupled to the output of the inverting amplifier.
11. A dynamic biasing circuit for biasing a collector current of an amplifier receiving a variable power input signal, comprising: means for obtaining a sample signal representative of the input signal; means for substantially generating a DC signal corresponding to the sample signal; and means responsive to the substantial DC signal level for adjusting the amplifier collector current.
12. The biasing circuit of claim 11 , wherein the means for generating a DC signal comprise a signal level detection circuit that employs a biased diode to detect successive amplitude peaks of the sample signal and includes one or more capacitors configured to remove residual AC components of the sample signal passed through the biased diode.
18
13, The biasing circuit of claim 12, wherein the means for generating a DC signal further comprise a first operational amplifier configured to receive an input signal from a cathode terminal of the biased diode,
14. The biasing circuit of claim 13, wherein the means for adjusting the amplifier collector current comprise a second operational amplifier configured to receive an output of the first operational ampUfier.
15, The biasing circuit of claim 14, wherein the second operational amplifier is an inverting operational amplifier.
16, The biasing circuit of claim 14, wherein an output of the second operational amplifier is connected to a base terminal of the amplifier being biased.
17, The biasing circuit of claim 14, wherein the means for adjusting the amplifier collector current further comprise a pass transistor configured to receive, and be controlled by, an output of the second operational amplifier.
18. The biasing circuit of claim 17, wherein the pass transistor has an emitter terminal connected to a base terminal of the amplifier being biased,
19. The biasing circuit of claim 11, wherein the means for adjusting the amplifier collector current comprise a pass transistor having an emitter terminal connected to a base terminal of the amplifier.
19
21. A method of controlling a supply current in an amplifier receiving a variable power input signal, comprising the steps: sampling the variable power input signal; generating a substantially constant signal corresponding to the power level of the variable input signal; generating a biasing signal from the substantially constant signal; and varying the supply current of the amplifier with respect to the biasmg signal.
22, The method of claim 21, further comprising the step of amplifying the substantially constant signal,
23. The method of claim 21, wherein the level of the biasing signal is inversely varied with respect to the level of the substantially constant signal,
24. The method of claim 23, further comprising the step of amplifying the substantially constant signal,
25. The method of claim 24, wherein the amplifier is a bipolar transistor based amplifier.
26. The method of claim 25, wherein the biasing signal is applied to the input of the amplifier.
27. The method of claim 24, wherein the amplifier is a FET transistor based amplifier,
20
28. The method of claim 27, wherein the biasmg signal is applied to the source of the amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU76274/98A AU7627498A (en) | 1996-12-02 | 1997-11-20 | Dynamic biasing circuit for amplifiers |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US75975796A | 1996-12-02 | 1996-12-02 | |
| US08/759,757 | 1996-12-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1998025339A1 WO1998025339A1 (en) | 1998-06-11 |
| WO1998025339B1 true WO1998025339B1 (en) | 1998-07-23 |
Family
ID=25056836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1997/021590 WO1998025339A1 (en) | 1996-12-02 | 1997-11-20 | Dynamic biasing circuit for amplifiers |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU7627498A (en) |
| TW (1) | TW351030B (en) |
| WO (1) | WO1998025339A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19831561A1 (en) * | 1998-07-14 | 2000-01-20 | Siemens Ag | Auxiliary direct (DC) voltage generating circuit using supply voltage for HF signal driving stage |
| EP1203447B1 (en) * | 1999-08-10 | 2004-06-16 | Siemens Aktiengesellschaft | Method and device for operating a radio frequency power amplifier |
| US6300837B1 (en) * | 2000-03-28 | 2001-10-09 | Philips Electronics North America Corporation | Dynamic bias boosting circuit for a power amplifier |
| US7262657B2 (en) * | 2005-03-21 | 2007-08-28 | Skyworks Solutions, Inc. | Bias control for reducing amplifier power consumption and maintaining linearity |
| US7729674B2 (en) | 2007-01-09 | 2010-06-01 | Skyworks Solutions, Inc. | Multiband or multimode receiver with shared bias circuit |
| CN111510176B (en) * | 2020-04-23 | 2020-12-29 | 华兴通信技术有限公司 | Digital microwave control system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4317083A (en) * | 1979-03-19 | 1982-02-23 | Rca Corporation | Bias adjustment responsive to signal power |
| JPH05267585A (en) * | 1992-03-19 | 1993-10-15 | Mitsubishi Electric Corp | Amplifier |
-
1997
- 1997-11-20 AU AU76274/98A patent/AU7627498A/en not_active Abandoned
- 1997-11-20 WO PCT/US1997/021590 patent/WO1998025339A1/en active Application Filing
- 1997-11-27 TW TW086117824A patent/TW351030B/en active
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