Near-threshold low-power-consumption quadrature voltage controlled oscillator

Abstract

The invention discloses a near-threshold low-power-consumption quadrature voltage controlled oscillator. The voltage controlled oscillator comprises an oscillator main body circuit and a self-detection bias circuit, wherein a phase coupling circuit in the oscillator main body circuit and a peak value detection circuit in the self-detection bias circuit are combined, so that current is multiplexed, and the power consumption is lowered. The near-threshold low-power-consumption quadrature voltage controlled oscillator works under a relatively high bias voltage at the beginning of oscillation start, and oscillation of the circuit can be started rapidly under large current. After oscillation start, four PMOS (P-channel Metal Oxide Semiconductor) transistors limit phase differences among four paths of oscillation signals at 90 degrees, detect a peak voltage and control the bias circuit to lower a bias point, so that the power consumption is lowered, and the noise performance is optimized.

Description

technical field [0001] The invention relates to an oscillator design technology, in particular to a low power consumption quadrature voltage-controlled oscillator at a near-threshold voltage. Background technique [0002] The PLL is an important part of the RF transceiver system. Under the near-threshold power supply voltage, most applications still require low power consumption, large swing, and strong drive for the PLL, which brings great challenges to the design of the PLL. challenge. The quadrature voltage controlled oscillator (Quadrature Voltage Controlled Oscillator, QVCO for short) can provide four quadrature outputs and has a strong driving capability, which is of great significance for reducing the overall power consumption of the radio frequency transceiver system, so QVCO is widely used In the RF phase-locked loop system. [0003] At present, the design of QVCO at near-threshold voltage mainly faces the problem of fast start-up and low power consumption. In th...

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Problems solved by technology

On the other hand, the additional phase coupling tube will inevitably affect the swing or power consumption

Usually, the application has relatively high requirements on the output swing of the QVCO. Only the parallel coupling method can not sacrifice the swing, but it needs to consume extra current.

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