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1. (WO2018204417) RF QUADRATURE MIXING DIGITAL-TO-ANALOG CONVERSION

Pub. No.:    WO/2018/204417    International Application No.:    PCT/US2018/030532
Publication Date: Fri Nov 09 00:59:59 CET 2018 International Filing Date: Wed May 02 01:59:59 CEST 2018
IPC: H03D 7/14
H03H 11/04
H03M 1/66
H04B 1/26
Applicants: JARIET TECHNOLOGIES, INC.
Inventors: WONG, Ark-Chew
HORNBUCKLE, Craig A.
ALEXANDER, Richard Dennis
Title: RF QUADRATURE MIXING DIGITAL-TO-ANALOG CONVERSION
Abstract:
A double-balanced radio-frequency (RF) mixing digital-to-analog converter (DAC) apparatus includes a load network, a first set of resistive DAC driver circuits and a first mixing core. The first mixing core can receive first RF input signals from the first set of resistive DAC driver circuits and can provide a first mixed signal to the load network. The first mixing core includes a first input differential pair coupled to two first cross-coupled differential pairs. The first input differential pair can receive first RF input signals at respective first input nodes. Each of the two first cross-coupled differential pairs can receive first positive and negative local oscillator (LO) signals at corresponding first input nodes. The first mixing core can mix the first RF input signals with the first positive and negative LO signals.