发明名称 |
LOW NOISE AND LOW POWER VOLTAGE-CONTROLLED OSCILLATOR (VCO) USING TRANSCONDUCTANCE (gm) DEGENERATION |
摘要 |
Certain aspects of the present disclosure generally relate to voltage-controlled oscillators (VCOs) using a lowered or an adjustable negative transconductance (−gm) compared to conventional VCOs. This −gm degeneration technique suppresses the noise injected into an inductor-capacitor (LC) tank of the VCO, thereby providing lower signal-to-noise ratio (SNR) for a given VCO voltage swing, lower power consumption, and decreased phase noise. One example VCO generally includes a resonant tank circuit, an active negative transconductance circuit connected with the resonant tank circuit, and a bias current circuit for sourcing or sinking a bias current through the resonant tank circuit and the active negative transconductance circuit to generate an oscillating signal. The active negative transconductance circuit includes cross-coupled transistors and an impedance connected between the cross-coupled transistors and a reference voltage. |
申请公布号 |
US2015263671(A1) |
申请公布日期 |
2015.09.17 |
申请号 |
US201414204542 |
申请日期 |
2014.03.11 |
申请人 |
QUALCOMM Incorporated |
发明人 |
NGUYEN Thinh Cat;YANG Jeongsik;BROCKENBROUGH Roger Thomas;BICAKCI Ara;SAVLA Anup;WANG Shen |
分类号 |
H03B5/12;H04B1/40 |
主分类号 |
H03B5/12 |
代理机构 |
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代理人 |
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主权项 |
1. A voltage controlled oscillator (VCO), comprising:
a resonant tank circuit; an active negative transconductance circuit connected with the resonant tank circuit, comprising:
cross-coupled transistors; andan impedance connected between the cross-coupled transistors and a reference voltage; and a bias current circuit for sourcing or sinking a bias current through the resonant tank circuit and the active negative transconductance circuit to generate an oscillating signal. |
地址 |
San Diego CA US |