CMOS Injection-Locked Frequency Quadrupler/Quintupler

Abstract

This paper designs a C-band single-stage LC-tank injection locked frequency quintupler (ILFQ) fabricated in 0.18 μm CMOS process. The differential input/output ILFQ circuit is made of a firstharmonic injection-locked frequency oscillator (ILO) and a frequency quadrupler/quintupler. The freerunning oscillation frequency of the ILFQ is around 7.6 GHz. At the dc power consumption of 9.9 mW and at the incident power of 0 dBm, the input locking range is from the incident frequency 1.456 GHz to 1.644 GHz to provide an output signal source from the frequency 7.28 GHz to 8.22 GHz. The whole chip occupies a die area of 1.114×1.060 mm 2 . The designed circuit is also used as a new X-band single-stage LC-tank injection locked frequency quadrupler, which shows measured ×4 output locking range from 7.82 GHz to 8.6 GHz.INDEX TERMS frequency quadrupler, injection-locked frequency quintupler, LC-tank, locking range, 0.18 μm CMOS.

Injection-Locked Frequency Sixtuplers in 90 nm CMOS by Using the Push-Push Doubler

“…ILFMs are often used with oscillators or phase-locked loops to relax the signal source design at a low frequency while supplying a high output frequency signal. A previous C-band single-stage ×6 ILFM is unsuitable for 5 G application, and it uses an injection-locked oscillator (ILO) with a mixer-type frequency tripler with the aid of a selfgenerated frequency doubler signal for enhancing the injection efficiency [5], [6]. The other CMOS two-stage ×6 ILFM [7], [8] utilizes a single-FET acting as a frequency tripler (FT) in front of an ILO and also as a push-push frequency doubler.…”