Voltage coupling circuit for digital-to-time converter

Details Voltage coupling circuit for digital-to-time converter Voltage coupling circuit for digital-to-time converter

1989-08-31

1990-11-27

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

307234, 3281291, H03M 182

Patent

active

049739786

ABSTRACT:
A voltage coupling circuit for use in a digital-to-time converter insures that converter operation is stabilized against temperature and power supply variations. The digital-to-time converter operates by comparing a ramp voltage to a threshold voltage that is set in accordance with an input digital word. The voltage coupling circuit, which causes the ramp voltage to track changes in the threshold voltage, includes a current mirror arrangement that separates the voltage coupling and ramp generation functions. As a result, transistor base currents are not drawn through the ramp capacitor, and accuracy is improved in the case of long time delays.

REFERENCES:
patent: 3654494 (1972-04-01), Bartlett et al.
patent: 4044272 (1977-08-01), Darrow
patent: 4150368 (1979-04-01), Chea, Jr.
patent: 4381497 (1983-04-01), Lillis et al.
patent: 4492954 (1985-01-01), Harris et al.
patent: 4742331 (1988-05-01), Barrow et al.

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