A Low Power Push-Push Differential Vco Using Current-Reuse Circuit Design Technique

Abstract

Abstract-This paper presents a complementary metal-oxidesemiconductor (CMOS) differential voltage-controlled oscillator (VCO) implemented with the push-push principle. The push-push VCO uses two frequency doublers stacked in series with an LC quadrature voltage-controlled oscillator (QVCO) to share the dc current with the QVCO for low power consumption. The proposed CMOS VCO has been implemented with the TSMC 0.18 µm CMOS technology, and the die area is 0.822 × 1.564 mm 2 . At the supply voltage of 0.9 V, the total power consumption is 3.15 mW. The free-running frequency of VCO is tunable from 10 GHz to 11.15 GHz as the tuning voltage is varied from 0.0 V to 1.2 V. The measured phase noise at 1 MHz frequency offset is −114.93 dBc/Hz at the oscillation frequency of 9.99 GHz, and the figure of merit (FOM) of the proposed VCO is −190.0 dBc/Hz.

A Q-Band FREQUENCY SYNTHESIZER IN 0.13 ΜM SIGE BICMOS

“…Figure 2 shows the schematics of the differential cross-coupled LC-VCO [4][5][6]. Since the g m of CMOS and HBT devices are both large enough at the oscillator frequency of 21 GHz in 0.13 µm processes; CMOS devices have the advantages of lower saturation voltage (V sat ) and better linearity over HBTs, thus NMOS is more suitable for supplying sufficient output voltage swing to drive the next stage.…”

Design of Q-enhanced Class-C VCO with robust start-up and high oscillation stability

“…The linear tuning voltage range was from 0.6 V to 1.8 V. The linear tuning frequency range was 120 MHz in one single sub-band with a VCO gain of 100 MHz/V, and the whole tuning frequency range including all the 4 sub-bands was from 3.25 GHz to 3.55 GHz. Table I gives a comparison between our work and other previous studies [4,5,6,7,8,9]. A widely used FoM that permits a fair comparison of oscillators is adopted here:…”