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

H - Electricity

03

D

325/111

H03D 1/22 (2006.01) H03D 7/16 (2006.01) H04B 1/30 (2006.01)

Patent

CA 1293302

? PHN 12.236 Abstract "Gain and Phase Correction in a Dual Branch Receiver" A dual branch receiver consists 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.c) is connected to the first and second paths. A first local oscillator frequency (.omega.o) is supplied in quadrature to the first and second mixers (16, 17), where.omega.c-.omega.o = .DELTA..omega. and .DELTA..omega.is of the order of 2.pi. x 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 centred 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° 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. (Figure 5)

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