Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Patent
1997-05-08
1999-06-22
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
327255, 327258, 327238, 327243, H03H 1116, H03K 300
Patent
active
059146230
ABSTRACT:
A 90.degree.-phase shifter which operates in condition both of high-speed and low dissipation power, and an output signal with precise 90.degree.-phase difference is capable of taking off is provided. It causes input signals with complementary relation each other to input toward input terminals. A 1/2 frequency divider is composed of bi-differential transistors Tr5 to Tr12, and load resistances R1 to R4. The 1/2 frequency divider outputs a 90.degree.-phase difference signal to output terminals 11 to 14 based on collector current of signal input transistors Tr1 and Tr2. The collector current corresponds to the input signal. A duty ratio monitoring load 2 converts these collector currents into voltage. A low-pass filter 3 takes off a DC component corresponding to an offset from 50%-duty ratio of an input voltage from the converted voltage. A DC component amplifier amplifies the DC component thus performing feedback to the input terminals 8 and 9. For this reason, the duty ratio of the collector current of the signal input transistors Tr1 to Tr2 comes precisely into 50%.
REFERENCES:
patent: 4472645 (1984-09-01), White
patent: 4696055 (1987-09-01), Marshall
patent: 4857777 (1989-08-01), Altes
patent: 5179731 (1993-01-01), Trankle et al.
patent: 5317276 (1994-05-01), Yamamoto
Callahan Timothy P.
Luu An T.
NEC Corporation
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