Abstract
A wide-band divide-by-2 injection-locked frequency divider (ILFD) based on a distributed dual-resonance high-order tank is presented. The ILFD employs a distributed LC network as the dual resonance tank and achieves an ultra-wide locking range. Fabricated in a 65 nm 1P7M LP-CMOS process, the divide-by-2 ILFD consumes 7 mW from a 0.7 V power supply and realizes a locking range of 87.0%, from 13 GHz to 33 GHz. The core circuit occupies an area of 0.22 mm × 0.5 mm.
Highlights
This paper proposes a wide-band divide-by-2 injection-locked frequency divider (ILFD) implemented in the 65 nm 1P7M
The injected current should be able to compensate for this phase shift to sustain the ILFD oscillating at the new frequency f new
When the injection power is lowered to −6 dBm, the proposed ILFD still sustains a locking range of 69.6%, from 15 GHz to 31 GHz
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. An original ILFD injects the input signal indirectly from the tail transistor of an oscillator [1]. This indirect injection topology entails two issues. In Reference [3], a multi-order LC oscillator is used to expand the locking range to 25.9%. The work in [4] was further investigated in [6], and the locking range was expanded to 62.9%. In this case, a transformer with a low coupling factor was needed.
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