Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit
Patent
1995-10-10
1997-04-29
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Nonlinear amplifying circuit
330252, 330260, G06G 726
Patent
active
056253184
ABSTRACT:
A tunable quadrature phase shifter including two branches each constituted by the cascade connection of a filter, an amplifier and a summing circuit, and two cross-connections constituted by amplifiers interconnecting the filter of one branch to the summing circuit of the opposite branch. An accurate 90 degrees phase shift between the two output signals is obtained by controlling the tail currents of the four amplifiers. The phase shifter used in mobile telecommunication transceivers may be easily and accurately tuned because the signals used in the summing circuits all have a similar amplitude. It is further adapted to operate with only a 3 Volt battery supply as used in wireless phones. The bandwidth of the amplifiers is increased by using double differential pair amplifiers which behave as cascode arrangements.
REFERENCES:
patent: 4427949 (1984-01-01), Yamaguchi et al.
patent: 4560955 (1985-12-01), Sauer
patent: 4745370 (1988-05-01), McGinn
patent: 4774475 (1988-09-01), Lavoie
patent: 4806792 (1989-02-01), Simmons
"Analysis and design of analog integrated circuits" of P.R. Gray and R.G. Meyer, published by Wiley & Sons, NY 1977, pp. 563-575.
"Pulse, Digital and Switching Waveforms" by Millman and Tabu (1965), Chapter 4-6 entitled Frequency response of a transistor stage, pp. 121-126, Chapter 4-6.
Duvivier Eric
Sallaerts Daniel
Sevenhans Joannes M. J.
Alcatel NV
Callahan Timothy P.
Wells Kenneth B.
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