Low Voltage Low Power Quadrature LC Oscillator Based on Back-gate Superharmonic Capacitive Coupling
-
Minglin Ma
and
Zhijun Li
Abstract
This work introduces a new low voltage low power superharmonic capacitive coupling quadrature LC oscillator (QLCO) made by coupling two identical cross-connected LC oscillators without tail transistor. In each of the core oscillators, the back-gate nodes of the cross-coupled NMOS pair and PMOS pair, acting as common mode nodes, have been connected directly. Then the core oscillators are coupled together via capacitive coupling of the PMOS common mode node in one of the core oscillators to the NMOS common mode node in the other core oscillator, and vice versa. Only capacitors are used for coupling of the two core oscillators and therefore no extra noise sources are imposed on the circuit. Operation of the proposed QLCO was investigated with simulation using a commercial 0.18 µm RF CMOS technology: it shows a power dissipation of 5.2 mW from a 0.6 V supply voltage. Since the proposed core oscillator has Complementary NMOS and PMOS cross coupled pairs, and capacitive coupling method will not introduce extra phase noise, so this circuit can operate with a low phase noise as low as −126.8 dBc/Hz at 1 MHz offset from center oscillation frequency of 2.4 GHz, as confirmed with simulation.
©[2013] by Walter de Gruyter Berlin Boston
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Articles in the same Issue
- Masthead
- Compact Microstrip Low-pass Filter with Wide Stop-band and Sharp Roll-off
- Design of a Circular Polarized Horn Antenna with an Anisotropic Metamaterial Slab
- Optimal Beamforming for Multi-antenna Relaying Schemes in Cognitive Radio Networks
- Performance Analysis of Dual-hop MIMO Relay Systems with MRT&RAS in the Presence of Co-channel Interference
- Joint Network Selection and Discrete Power Control in Heterogeneous MIMO Networks: A Game Theoretical Approach
- Red-Black Tree Based Fast and Accurate Ray Tracing for Indoor Radio Wave Prediction
- Influence of Intra-cell Connections on the Traffic Calculation of Radio Resources in Mobile Network
- Threshold Determining for MinabsLLR Stopping Criterion for Turbo Codes
- A Wideband Super Source Follower with Improved Performance and Its Application
- Low Voltage Low Power Quadrature LC Oscillator Based on Back-gate Superharmonic Capacitive Coupling
