Low-power-consumption orthogonal LC (inductance/capacitance) voltage controlled oscillator based on current multiplex

Abstract

The invention discloses a low-power-consumption orthogonality LC (inductance / capacitance) voltage controlled oscillator based on current multiplex, which mainly solves the disadvantages that the existing LC voltage controlled oscillator has high power consumption and poor tuning linearity. The low-power-consumption orthogonality LC voltage controlled oscillator comprises an upper loop, a lower loop and a current mirror, wherein a PMOS (P-channel Metal Oxide Semiconductor) resonant loop of the upper loop comprises a difference fixed capacitor array Ca1, a variable capacitor array Ca2, a switchcapacitor array Ca3 and an inductor La; an NMOS (N-channel metal oxide semiconductor) resonant loop of the lower loop comprises a difference fixed capacitor array Cb1, a variable capacitor array Cb2,a switch capacitor array Cb3 and an inductor Lb; the inductors La and Lb adopt symmetrical inductors with taps in the middle, and the taps in the middle are connected to realize the current multiplex; on the basis of providing basic currents, the current mirror is additionally provided with two paths of bias currents, connected in a circuit, so as to reduce power consumption; the two variable capacitor arrays Ca2 and Cb2 adopt an array structure that two variable capacitors with different bias voltages are connected in parallel to improve the tuning linearity of the LC voltage controlled oscillator. The voltage controlled oscillator can be used for a frequency synthesizer of a radio frequency front-end receiver system.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, and relates to a low-power orthogonal LC voltage-controlled oscillator, in particular to a novel LC voltage-controlled oscillator in a current multiplexing mode, which can be used in a frequency synthesizer of a radio frequency front-end receiver system . Background technique [0002] With the continuous development of society, science and technology are changing with each passing day, especially modern wireless communication technology has greatly changed the way of life of human beings. With the popularity of handheld wireless communication devices, such as GPS positioning systems and mobile phones, wireless communication devices are developing from single modules and discrete devices to miniaturization, low power consumption, low cost, and high integration. In almost all wireless communication devices, voltage-controlled oscillators are essential. Voltage-controlled oscilla...

AI Technical Summary

Problems solved by technology

In the current quadrature LC voltage-controlled oscillator, for each oscillation circuit, the power supply must provide a dedicated current path to ensure the normal operation of the oscillator. As a result, the power consumption of the circuit is relatively large, and with the integration Circuits have higher and higher requirements for low power performance, and the unimproved design of quadrature LC voltage-controlled oscillators can no longer meet the requirements of RF receiver systems for low power consumption, thus making low power consumption a quadrature LC voltage-controlled oscillator. One of the difficulties in oscillator design

In order to meet the low power requirements of RF transceivers for quadrature LC voltage-controlled oscillators, various low-power quadrature LC voltage-controlled oscillator structures have been proposed, but in these low-power structures, most of them sacrifice other indicators Such as phase noise or circuit complexity to improve power consumption performance, related literature such as "Muer B D, hoh N Borremans, et a1.A 1.8GHz highly-tunable low-phase-noise CMOS VCO.IEEE Custom Integrated Circults Conference, 2000 ; J. Bhattacharjee, D. Mukherjee, E. Gebara, S. Nuttinck and J. Laskar, "A5.8GHz fully integrated low power low phase noise CMOS LC VCO for WLAN applications," in Proc.IEEE Int.Sym.on PFIC , Jun.2002", although the power consumption performance of the quadrature LC voltage-controlled oscillator proposed in the literature has been improved, but the circuit complexity is significantly higher than the original, and the phase noise performance is significantly worse

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