Transformer-Based Current-Reuse Armstrong and Armstrong-Colpitts VCOs
- Authors
- Ha, Keum-Won; Ryu, Hyuk; Park, Joonhong; Kim, Jeong-Geun; Baek, Donghyun
- Issue Date
- Sep-2014
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Armstrong; CMOS; colpitts; complementary; current reuse; G(m) boosted; voltage-controlled oscillator (VCO)
- Citation
- IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, v.61, no.9, pp 676 - 680
- Pages
- 5
- Journal Title
- IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
- Volume
- 61
- Number
- 9
- Start Page
- 676
- End Page
- 680
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/11868
- DOI
- 10.1109/TCSII.2014.2331112
- ISSN
- 1549-7747
1558-3791
- Abstract
- This brief proposes two new types of current-reuse voltage-controlled oscillators (VCOs). One is a current-reuse Armstrong VCO (CR-AVCO) and the other is a complementary current-reuse Armstrong-Colpitts VCO (CR-ACVCO). Two one-transistor-based NMOS and PMOS AVCOs are combined into a complementary current-reuse form by sharing a transformer. The CR-ACVCO further improves the CR-AVCO by adding the Colpitts capacitive feedback, which has higher negative transconductance and, consequently, lower phase noise than that of the CR-AVCO. All the inductors are realized with one five-port transformer. The phase noise of the CR-AVCO and CR-ACVCO at 1-MHz offset frequency is -113.3 dBc/Hz at 4.84 GHz and -120.1 dBc/Hz at 5.3 GHz, respectively. The CR-AVCO and CR-ACVCO consume 2.32 and 2.74 mW from a 0.8- and 1.2-V supply, resulting in a high figure of merit with tuning range (FoMT) of -187.5 and -194.2 dBc/Hz, respectively. The proposed CR-VCOs are implemented in a 0.13 mu m CMOS.
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