A W‐band injection‐locked frequency divider with modified transformer coupling resonant

Abstract

A W‐band injection‐locked frequency divider (ILFD) with modified transformer coupling resonant is demonstrated and implemented in a 40‐nm CMOS technology. The locking range and operation frequency of the ILFD is improved without increasing chip area or circuit complexity. The measured locking range of the ILFD covers from 86 to 104 GHz. The measured phase noise of the modified W‐band ILFD is −114.89 dBc/Hz at 1 MHz. The ILFD also attains a figure of merit normalized (FoM) of 243.1.

An ultra-wideband injection-locked frequency divider with a multi-order resonator and the passive injection-boosted technique

“…In [23], the design employing the transformer-based high-order resonator exhibits a LR from 32.4 to 61.9 GHz. [26,27,28] prove the effectiveness of the transformer coupling resonator.…”

“…Nevertheless, the traditional injection-locked divider has a narrow operation bandwidth. Much research [18,19,20,21,22,23,24,25,26,27,28] has been conducted to enhance the LR of the injection-locked frequency dividers and multipliers. [18] reduces the Q value of the tank to attain a flat phase response.…”