In order to achieve low power consumption, many improved VCO schematics were proposed. However, although the problem of power consumption has been improved, the amplitude imbalance of the output signals is relatively larger than the conventional cross-coupled VCO. Therefore, a new modified STM technique to improve the amplitude imbalance of VCO is presented. The measured amplitude imbalance ratio is less than 0.2%. It reduces from 1.7% of the VCO without modified STM technique. This back-gate coupled current-reused QVCO has been implemented using the TSMC 0.18um mixed signal/RF CMOS IP6M technology and the die area is 0.84x1.1mm(2). The measured phase noise at 1MHz offset is 117.4dBc/Hz at the oscillation frequency of 5.0 GHz. The figure of merit (FOM) of the proposed QVCO is -184.1 dBc/Hz.
|Title of host publication||2010 ASIA-PACIFIC MICROWAVE CONFERENCE|
|Number of pages||4|
|State||Published - 2010|
|Event||22nd Asia-Pacific Microwave Conference (APMC) - Yokohama, Japan|
Duration: 7 Dec 2010 → 10 Dec 2010
|Name||Asia Pacific Microwave Conference-Proceedings|
|Conference||22nd Asia-Pacific Microwave Conference (APMC)|
|Period||7/12/10 → 10/12/10|
- CMOS integrated circuits; current-reused; modified STM technique; quadrature VCO (QVCO); radio frequency (RF)
Chiu, P-J., Wu, K-I., & Jou, C. (2010). Back-Gate Coupled Current-Reused QVCO with Modified STM Technique. In 2010 ASIA-PACIFIC MICROWAVE CONFERENCE (pp. 1047-1050). (Asia Pacific Microwave Conference-Proceedings). IEEE.