Digital to analog converter with reduced ringing
AssigneeBroadcom Corporation
InventorsKlaas Bult, Chi-Hung Lin
Life of this patent
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Abstract
Binary indications are converted to an analog representation with significant reduction in ringing at the transitions between successive binary indications and in the period during each binary indication. The binary indications are disposed in a row-and-column matrix to provide a thermometer code. Each stage of the converter includes a decoder and latch arranged so the decoder inputs settle before the latch is set by the clock pulses. The stages are implemented in complementary CMOS. Complementary transistors are biased so one transistor of the pair is driven to the rail while the other transistor of the pair floats. A dummy CMOS transistor is used to balance the number of transistors in the decoder paths.
Claims18
A digital-to-analog converter (DAC), comprising:
- a first circuit configured to decode a digital signal to provide a first output according to a clock signal, the first circuit latching the first output after the digital signal has settled;
- and
- a second circuit configured to provide a second output representative of an analog value of the digital signal based on the first output.
A method to convert a digital signal to an analog value, comprising:
- (a) decoding a digital signal to provide a first output according to a clock signal;
- (b) latching the first output after the digital signal has settled;
- and
- (c) providing a second output representative of the analog value of the digital signal based on the first output.
Dependencies are inferred from the claim text.