US 7,321,265 B2
Distortion compensating circuit having negative gain deviation, power amplifier using the same, and communication device having power amplifier
Tohru Oka, Nara (Japan)
Assigned to Sharp Kabushiki Kaisha, Osaka (Japan)
Filed on Oct. 12, 2005, as Appl. No. 11/247,292.
Claims priority of application No. 2004-344591 (JP), filed on Nov. 29, 2004.
Prior Publication US 2006/0114066 A1, Jun. 01, 2006
Int. Cl. H03F 1/26 (2006.01)
U.S. Cl. 330—149  [330/302] 15 Claims
OG exemplary drawing
 
1. A distortion compensating circuit and having a negative gain deviation for an amplifier circuit having a positive gain deviation, comprising:
a circuit including a diode having a predetermined turn-on voltage connected between a signal path including the amplifier circuit and ground,
a voltage applied to said diode comprising a forward bias voltage of a value less than the turn-on voltage of said diode, and
wherein an amount of change in a ratio between output power output from the signal path and input power input to the signal path with respect to the input power is substantially zero or negative.