Wideband 0-90 degrees adjustable phase shifter

Details Wideband 0-90 degrees adjustable phase shifter Wideband 0-90 degrees adjustable phase shifter

1988-04-07

1989-09-12

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330107, 307262, H03F 345

Patent

active

048663972

ABSTRACT:
The present invention is an improved phase shift circuit for a recovered clock signal used to recover data which provides an adjustable 90 degrees phase shift using a linear, constant current charge without requiring an external capacitor for integrated receivers and repeaters. A pair of differential transistors receive an input signal and produce an output with a capacitor coupled between their output electrodes. A pair of switching transistors are coupled between the output electrodes and a voltage source, with the switching transistors being controlled by another differential transistor pair coupled to the input voltage. Each switching transistor provides a fixed voltage level to the capacitor, thus giving a constant current for a linear charge curve. The combination of the two switching transistors limits the voltage swing to 2V.sub.BE. The phase shift is made adjustable by using one current source for the first differential pair and a second current source for the second differential pair. The current source of the first differential pair is adjustable, to provide the phase shift adjustment.

REFERENCES:
patent: 3725801 (1973-04-01), Beelitz
Ericsson Review, No. 4 (1986), pp. 135-139, "A New Generation of 2Mbit/s Repeaters", D. Danielsen, T. Ilstrom & C. Landberg.
RIFA AB 1986, pp. 1-6, "Regenerative PCM-Repeater".
EDN, Mar. 21, 1985, pp. 185-200, M. K. Kimyacioglu, "Implement Bell TIC PCM Repeater Using Just Two IC's".

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