Single ended to differential converter and 50% duty cycle signal

Details Single ended to differential converter and 50% duty cycle signal Single ended to differential converter and 50% duty cycle signal

1997-06-13

1999-04-20

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Phase shift by less than period of input

327175, 327238, 327246, H03K 300

Patent

active

058960538

ABSTRACT:
A high frequency, current mode, single-ended-to-differential signal converter with low input impedance constant to very high frequencies and a balanced output signal even for large signals. A wide range of input voltages may be accommodated and a d.c. offset correction added. A circuit for achieving a precise fifty percent duty cycle digital signal is disclosed. A circuit for ensuring a 90.degree. phase differential between two signals needed for quadrature multiplication is disclosed. Unusual precision in phase control of the quadrature signals needed for modulation and demodulation of wireless signals is obtained by the use of feedback circuits in both the duty cycle generator and phase shifter.

REFERENCES:
patent: 4527075 (1985-07-01), Zbinden
patent: 5281924 (1994-01-01), Maloberti et al.
patent: 5408135 (1995-04-01), Choi et al.
patent: 5572158 (1996-11-01), Lee et al.

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