Patent ID: 11949546
Assignee: ERIDAN COMMUNICATIONS, INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 26:
27. A polar transmitter, comprising:
a polar modulator having a switch-mode power amplifier (SMPA) configured to produce a modulated radio frequency (RF) carrier; and
a passive output filter network coupled to an output of said polar modulator, said passive output filter network comprising a low-pass filter (LPF) connected in parallel with an absorptive high-pass filter (HPF),
wherein the LPF and absorptive HPF together comprise a non-complementary ladder filter, the LPF is a first type of filter and the absorptive HPF is a second type of filter different from the first type, and the first and second types of filters are selected from the group consisting of Butterworth, Chebyshev, Bessel, and Elliptic filter types.