Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Radio devices including power amplifier control circuits with hardware lockouts










Image Number 3 for United States Patent #6169885.

A battery powered radio device includes a transmitter, a control circuit, and a lockout circuit. The transmitter transmits radio communications and the transmitter includes a power amplifier which generates an amplified radiofrequency output signal. More particularly, the power amplifier uses both a positive supply voltage and a negative bias voltage for operation wherein the negative bias voltage is less than a supply ground voltage. The control circuit enables the power amplifier during transmission, and the control circuit includes a switch coupled in series between a positive supply voltage and the power amplifier. The switch is activated in response to a transmit activation signal when the negative bias voltage is coupled to the power amplifier. The lockout circuit prevents activation of the switch in response to the transmit activation signal when the negative bias voltage is not coupled to the power amplifier. In addition, the switch can be activated in response to a transmit activation signal by applying the negative bias voltage to the switch control gate and deactivated in the absence of the transmit activation signal by applying the positive supply voltage to the switch control gate.








 
 
  Recently Added Patents
Data portal for concurrent assessment
Light emitting device
Curved structural part made of composite material and a process for manufacturing such a part
Clip
Noise spectrum tracking in noisy acoustical signals
Methods and systems for automated segmentation of dense cell populations
State detection device, electronic apparatus, measurement system and program
  Randomly Featured Patents
Method and apparatus for supporting co-located coexistence mode
Speculation-aware memory controller arbiter
Method and apparatus for improving local blood and lymph circulation using low and high frequency vibration sweeps
Suspension of loteprednol etabonate for ear, eye, or nose treatment
Charge control of micro-electromechanical device
Oximeter sensor with digital memory encoding sensor data
Roll assembly with alignment spacer
Method of forming a data storage medium and data storage device by congruent sublimation
Remotely actuated beveling systems for a miter saw
Method and system for dynamic learning through a regression-based library generation process