Broadcom Corporation

Qualcomm Incorporated

Avago Technologies International Sales Pte. Limited

Chi-Hung Lin

Klaas Bult

Arya Behzad

Mehdi Hatamian

Oscar Ernesto Agazzi

Ramon Alejandro Gomez

Henry Samueli

Arthur Abnous

John L Creigh

Tom W Kwan

David E Kruse

Jan Mulder

Marcel Lugthart

Jan Roelof Westra

Rudy J Van De Plassche

Koon Lun Jackie Wong

The systems and methods discussed herein related to digital to analog conversion. A digital to analog conversion circuit can includes a digital input, an analog output, and a cell array. The digital to analog converter can also include an integrator, an analog to digital converter (ADC), and a summer coupled to the ADC, and an adaptation circuit coupled to the summer. The adaption circuit provides controls signals to the cell array.

System and method of digital to analog conversion adaptive error cancelling

Circuitry to remove switches from signal paths in integrated circuit programmable gain attenuators. Programmable gain attenuators and programmable gain amplifiers commonly switch between signal levels using semi-conductor switches. Such switches may introduce non-linearities in the signal. By isolating the switches from the signal path linearity of the PGA can be improved.

Gigabit ethernet transceiver with analog front end

A transceiver front-end provides an interface between a transmission medium and transmitter, and between a transmission medium and receiver. The transceiver front-end includes a hybrid circuit, a high-pass filter, and a gain stage, that permits the reduction or the complete elimination of buffer amplifiers. Buffer amplifiers can be eliminated because the hybrid circuit and/or the high-pass filter are adapted so that they can be directly connected to each other, without a loss in circuit performance. Furthermore, the high-pass filter and/or the gain stage are also adapted so they can be directly connected. As such, the transceiver front-end can be constructed using all passive components, reducing or eliminating excess heat generation.

Hybrid circuit for a transceiver front-end

Transceiver front-end

Provided is a circuit to perform single-ended to differential conversion while providing common-mode voltage control. The circuit includes a converter to convert a single-ended signal to a differential signal and a stabilizing circuit adapted to receive the differential signal. The stabilizing circuit includes a sensor configured to sense a common-mode voltage level of the differential signal and a comparator having an output port coupled to the converter. The comparator is configured to compare the differential signal common-mode voltage level with a reference signal common-mode voltage level and produce an adjusting signal based upon the comparison. The adjusting signal is applied to the converter via the output port and is operative to adjust a subsequent common-mode voltage level of the differential signal.

Single-ended-to-differential converter with common-mode voltage control

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.

Digital to analog converter with reduced ringing

Method for operating an analog to digital converter

Gigabit Ethernet transceiver with analog front end

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Mission Viejo, CA, United States of America

Chi-Hung Lin