Amplifier protection circuit

Details Amplifier protection circuit Amplifier protection circuit

H - Electricity

04

B

325/59

H04B 1/02 (2006.01) H02H 7/20 (2006.01) H03F 1/52 (2006.01) H03G 3/30 (2006.01)

Patent

CA 1038456

AMPLIFIER PROTECTION CIRCUIT ABSTRACT A protection circuit for a transmitter amplifier is provided which senses the forward power level and develops a first voltage which is compared with a reference voltage to provide a control voltage which controls the power developed by the transmitter amplifier. An increase in the forward power level is detected changing the control voltage to cause a reduction in the forward power developed by the transmitter amplifier. A decrease in forward power level is detected changing the control voltage to cause an increase in forward power developed by the transmitter amplifier. A forward power level below a predetermined level for a predetermined period of time is detected causing a reduction in the reference voltage. Reduction of the reference voltage reduces the control voltage to reduce or terminate the forward power of the transmitter amplifier. An excessive control voltage coupled to the transmitter amplifier is also detected increasing the first voltage which in turn causes a reduction in the control voltage thereby maintaining the control voltage below a preset level.

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