Intel Corporation

Agency for Science, Technology and Research

Chin Boon Tear

Amit Kumar Srivastava

Yuanjin Zheng

Sheng Jau Wong

Lay Hock Khoo

Siti Suhaila Mohd Yusof

An apparatus is provided which comprises: a data sampler coupled to an output of a driver, wherein the data sampler is to sample data and to compare it with a first threshold voltage and a second threshold voltage, and wherein the data sampler is to generate an up or down indicator according to comparing the data with the first and second threshold voltages; and logic coupled to the data sampler, wherein the logic is to receive the up or down indicator and to increment or decrement a number of already DC compensated impedance legs of the driver according to the up or down indicator.

High speed driver with adaptive termination impedance

A DCR RF front-end removes the DC term resulting from mixer port to port leakage and feeds RF and LO signals into the mixers with different phase combinations. The signal inputs to the mixers result in the intermediate frequency (IF) output of mixers being 180 degrees out of phase and their DC terms in phase. When subtracting the two outputs from each other the IF signals add up while the DC terms cancel giving a DC free output. A DC offset feedback tuning loop detects the DC offset in the IF domain and then feeds back the tuning voltage to current injection mixers. A multiplier cancels the IF signals and amplifies the DC offset and a comparator compares the amplified DC offset with a threshold voltage and controls the gain of current injection mixers. The feedback tuning loop thus tracks time-varying DC offsets in real-time.

DC offset-free RF front-end circuits and systems for direct conversion receivers

Growing community of inventors

Singapore, Singapore

Chin Boon Tear