Method and apparatus for increasing amplifier efficiency
November 1, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDifferential amplifier with auto bias adjust Amplifier having digital bias control apparatus Transmitter circuit Transmitter using gallium arsenide FET with means for controlling gate bias voltage of the FET for suppressing undesired signal at a start condition of the transmitter Dual mode power amplifier for radiotelephone RF amplifier bias circuit FET amplifier with gate voltage control Power amplifier saturation detection and correction method and apparatus Adaptive class AB amplifier for TDMA wireless communications systems Dual mode amplifier with bias control InventorsAssigneeApplicationNo. 332968 filed on 11/01/1994US Classes:330/133, Different bias control means for different stages of cascade amplifier330/134, Plural different bias control voltages provided by separate means330/279, And significant control voltage developing means330/285, Having particular biasing means455/126, With feedback of modulated output signal455/127.1Power control, power supply, or bias voltage supplyExaminersPrimary: Mullins, James B.Attorney, Agent or FirmForeign Patent References
International ClassH03G 003/30AbstractA transmitter (107) includes amplifying circuitry (203) and control circuitry (215, 217, 219) for biasing the amplifying circuitry (203) so that it operates closer to saturation with increased efficiency. The gate voltage signal (213), which provides a gate bias, is coupled to the amplifying circuitry (203) and is dynamically varied by the processor circuitry (219) in response to the value of the amplifier control voltage (211) coupled to the amplifying circuitry (203). The amplifier control voltage (211), which has a value for maintaining the output power of the amplifying circuitry (203) at a constant, is produced by the integrating circuitry (217) in response to a comparison of the detected power output signal (216) produced by the detecting circuitry (215) and the power output control signal (218) produced by the processor circuitry (219). Efficiency is realized by dynamically varying the gate voltage signal (213) to its largest magnitude so that the amplifying circuitry (203) may operate as close to saturation as possible while still maintaining a constant output power.Field of SearchWith control of input electrode or gain control electrode biasDifferent bias control means for different stages of cascade amplifier Plural different bias control voltages provided by separate means And significant control voltage developing means Having particular biasing means Carrier amplitude control (e.g., voice operated on/off) With feedback of modulated output signal | |
