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Voltage controlled oscillator (VCO) capable of adjusting linearity of gain and two-point modulator based on VCO

A linearity and modulator technology, applied in the direction of automatic power control, electrical components, etc., can solve the problems of increasing system complexity and power consumption, unfavorable continuous data transmission applications, etc., to improve data communication and transmission performance, increase Design Complexity and Power Consumption, Effect of Reducing Gain Mismatch

Inactive Publication Date: 2013-05-01
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similar solutions based on correction circuits require additional circuits, which increase system complexity and power consumption. At the same time, additional correction time is required before each modulation, which is not conducive to the application of continuous data transmission.

Method used

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  • Voltage controlled oscillator (VCO) capable of adjusting linearity of gain and two-point modulator based on VCO
  • Voltage controlled oscillator (VCO) capable of adjusting linearity of gain and two-point modulator based on VCO
  • Voltage controlled oscillator (VCO) capable of adjusting linearity of gain and two-point modulator based on VCO

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Embodiment Construction

[0030] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] image 3 It is a structural block diagram of the two-point modulator of the embodiment of the present invention. The two-point modulator of the present invention includes a PLL circuit and a modulation control circuit.

[0032] Such as image 3 As shown, the PLL circuit includes: a voltage-controlled oscillator VCO 3 , a loop filter 4 , a PFD, a charge pump (CP) 5 , and a frequency divider 6 . The output frequency Fout of the VCO 3 is divided by the frequency divider by 6, and the frequency and phase are compared with the reference frequency Fref in the PFD 5, and the result is a current signal generated by the charge pump 5, and the loop filter 4 performs low-pass filtering on the current signal , to generate a loop feedback control signal Vctl to control the oscillation frequency of the VCO 3, and realize stable frequency synthesis t...

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Abstract

The invention provides a voltage controlled oscillator (VCO) capable of adjusting the linearity of a gain and a two-point modulator based on the VCO. The two-point modulator is based on a phase-locked loop (PLL) circuit, wherein a control voltage of the VCO consists of two parts, namely a loop feedback control signal and a modulation control signal. For the modulation control signal, by connecting two or more groups of varactors in parallel and applying different direct current bias voltages, the mismatching of modulation gains is reduced because the varactors have the characteristic of adjusting the linearity of a frequency-voltage gain of the VCO; and each group of varactors is connected with a fixed capacitor in parallel, so the mismatching of a manufacturing process of the varactors can be reduced. By adoption of the circuit structure, the modulation error of the two-point modulator can be reduced.

Description

technical field [0001] The invention belongs to a wireless communication electronic system, in particular to a VCO with adjustable gain linearity and a two-point modulator based on the VCO. The invention has particular application but is not limited to transmitters and receivers of wireless communication or wireless sensor systems. Background technique [0002] Transceiver systems for wireless communication and wireless sensing usually require low-complexity and low-power implementations. For the wireless transmitter, the above-mentioned goal can be achieved by means of modulation based on a phase-locked loop (PLL). Existing implementation methods include PLL open-loop modulation, closed-loop modulation and two-point modulation. Open-loop modulation can achieve a relatively high data rate without being limited by the bandwidth of the PLL loop, and the complexity is also low. However, due to the influence of process, temperature environment and other conditions, it will caus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/099
Inventor 陈楠王陈銮林福江
Owner UNIV OF SCI & TECH OF CHINA
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