US 7,548,733 B2
Wireless transmitter having multiple power amplifier drivers (PADs) that are selectively biased to provide substantially linear magnitude and phase responses
Meng-An Pan, Irvine, Calif. (US)
Assigned to Broadcom Corporation, Irvine, Calif. (US)
Filed on Mar. 31, 2005, as Appl. No. 11/94,758.
Prior Publication US 2006/0229038 A1, Oct. 12, 2006
This patent is subject to a terminal disclaimer.
Int. Cl. H01Q 11/12 (2006.01); H04B 1/04 (2006.01)
U.S. Cl. 455—127.3  [455/114.2; 330/124 R] 19 Claims
OG exemplary drawing
 
1. A transmitter that is configured to transmit an input signal, comprising:
a first power amplifier driver (PAD) having a first input transistor with a corresponding first input capacitance, wherein a first bias is applied to the first input transistor so that the first input capacitance is directly proportional to an amplitude of the input signal; and a second PAD, coupled in parallel with the first PAD, having a second input transistor with a corresponding second input capacitance, wherein a second bias is applied to the second input transistor so that the second input capacitance is inversely proportional to the amplitude of the input signal; wherein respective outputs of the first PAD and the second PAD are combined to form an output for the transmitter.