Gain and phase correction in a dual branch receiver

Details Gain and phase correction in a dual branch receiver Gain and phase correction in a dual branch receiver

1988-09-06

1990-08-28

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

455260, 455324, 375 98, H04B 130

Patent

active

049531824

ABSTRACT:
A dual branch receiver consists of first and second branches (12, 14) respectively comprising first and third mixers (16, 20) and second and fourth mixers (17, 21). An input terminal (10) for a signal having a carrier frequency (.omega..sub.c) is connected to the first and second paths. A first local oscillator frequency (.omega..sub.o) is supplied in quadrature to the first and second mixers (16, 17), where .omega..sub.c -.omega..sub.o =.DELTA..omega. and .DELTA..omega. is of the order of 2.pi..times.100 radians/sec. A second local oscillator (30) frequency is supplied in quadrature to the third and fourth mixers (20, 21). An output signal is derived by connecting a sum circuit (22) and a difference circuit (24) to the first and second branches. The outputs of the sum and difference circuits (22, 24) are also used to provide gain and phase correction signals. It has been found that if the correction signals are based on signals centered on 2.DELTA..omega. then they are substantially free of ripple. The gain correction is derived by mixing the 2.DELTA..omega. signals derived by multiplying difference by difference (or sum by sum) with the 2.DELTA..omega. signals derived by multiplying sum by difference and low pass filtering. The phase correction is derived by mixing a 90.degree. phase shifted difference signal with the sum signal (or vice versa) and deriving the 2.DELTA..omega. signals which are mixed with 2.DELTA..omega. signals derived by multiplying the difference by difference (or sum by sum) and low pass filtering.

REFERENCES:
patent: 4476585 (1984-10-01), Reed
patent: 4574246 (1986-03-01), Yoshida
patent: 4584710 (1986-04-01), Hansen

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