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Design >> RF Design >> Differential Quadrature Signal Generation of Low Power
https://designers-guide.org/forum/YaBB.pl?num=1449769268

Message started by cheap_salary on Dec 10^th, 2015, 9:41am

Title: Differential Quadrature Signal Generation of Low Power
Post by cheap_salary on Dec 10^th, 2015, 9:41am

I would like to generate fully differential quadrature signals of 950MHz using PLL Frequency Synthesizer from 1900MHz differential VCO with low power.

Currently, I realize this by D-FF based on master-slave latch structure using CML.
However current consumptions are fairly large.

Alternate idea I have is using two D-FFs based on TSPC where one is rising edge triggered and the other is falling edge triggered. And I use two inveter and two buffer after them for generating fully differential quadrature signals, i, ib, q and qb.
However this scheme is pseudo differential.

Quadrature VCO can not be candidate.

I use 0.15um-CMOS of vdd=1.5V.

If you know good technique, could you share it with me ?

Title: Re: Differential Quadrature Signal Generation of Low Power
Post by raja.cedt on Dec 10^th, 2015, 12:48pm

use poly phase filters---

Title: Re: Differential Quadrature Signal Generation of Low Power
Post by loose-electron on Dec 14^th, 2015, 10:06pm

agreed - poly phase or another reactive filter network structure