Broadband phase shifter and vector modulator

Details Broadband phase shifter and vector modulator Broadband phase shifter and vector modulator

1991-06-17

1992-12-01

Laroche, Eugene R.

Wave transmission lines and networks

Coupling networks

Delay lines including a lumped parameter

333164, 307511, 307571, H03H 720

Patent

active

051682508

ABSTRACT:
A broadband phase shifter and vector modulator includes two artificial transmission lines interconnected by FETs to selectively produce and sum incremental phase shifts of an input signal. A number of low pass filter sections are connected in series to form the first of the two artificial transmission lines and a number of high pass filter sections are connected in series to form the second artificial transmission line. Use of low pass and high pass filters equalizes transit times of each phasor through the phase shifter so as to maintain the proper phase relationship between the phasors over a broad bandwidth. Each of the two artificial transmission lines are coupled to a transistor circuit connecting corresponding low and high pass filter sections. The phase shifter operates by selectively summing the output variable-amplitude phase-shifted signals generated within the transmission lines to produce an output signal having a phase shift between 0.degree. and 360.degree..

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E. Strid, "A Monolithic 10-GHz Vector Modulator", 1983 IEEE GaAs IC Symposium, pp. 109-112.

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