Voltage controlled oscillator with automatic amplitude control

A technology of automatic amplitude control and voltage-controlled oscillators, which is applied to power oscillators, electrical components, etc., and can solve problems such as excessive noise and complex structures

Inactive Publication Date: 2007-09-26
苏州中科半导体集成技术研发中心有限公司
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  • Application Information

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  • Voltage controlled oscillator with automatic amplitude control
  • Voltage controlled oscillator with automatic amplitude control
  • Voltage controlled oscillator with automatic amplitude control

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Embodiment Construction

[0014] The circuit principle block diagram of the voltage-controlled oscillator with automatic amplitude control involved in the present invention is shown in Fig. The design and implementation of the control feedback shunt circuit, the design and implementation of the bias and filter circuit, etc. The design steps are described below: See Figure 2.

[0015] 1. Design a low phase noise voltage controlled oscillator circuit. The negative resistance LC oscillator structure is used to realize the differential output, and the PMOS transistor is used as the active negative resistance device to obtain low phase noise performance.

[0016] A voltage-controlled oscillator with automatic amplitude control, a cross-coupled negative-resistance differential voltage-controlled oscillator with PMOS transistors as active devices, including two sets of differential parallel resonant circuits of varactor diodes and inductors. Its function is to realize negative resistance type resonant oscil...

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Abstract

The invention relates to technology field of voltage-controlled oscillator specially a type of voltage-controlled oscillator with automatic range control. It includes: negative resistance type difference structure voltage-controlled oscillator, oscillating range distinguishing circuit, range-controlled feedback diffluence circuit, voltage-controlled oscillator offset circuit and filter circuit, norm current generating circuit and oscillating output buffer circuit, it characterized in that: the oscillating range distinguishing circuit and range-controlled feedback diffluence circuit generate the feedback control signal to adjust the current output by offset circuit to the voltage-controlled oscillator according to the output amplitude of voltage-controlled oscillator, so the output amplitude can be stabled automatically.

Description

technical field [0001] The invention relates to the technical field of voltage-controlled oscillators, in particular to a voltage-controlled oscillator with automatic amplitude control. Background technique [0002] Voltage-controlled oscillators are widely used in modern digital circuits (especially high-speed circuits) and analog circuits (especially radio frequency transceiver circuits). In digital systems, they are mainly used as low-jitter clock signal sources. In analog systems, they are mainly Used as a LO signal source with low phase noise. In high-speed and radio-frequency applications, time-stable oscillation amplitude, frequency and low-noise signal output performance are very critical indicators for clock and local oscillator applications. In addition, it is also required that the output signal of the oscillation source must have environmental stability and process stability. Environmental stability means that when the oscillator works for a period of time, the...

Claims

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Application Information

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IPC IPC(8): H03B28/00H03B7/00H03B1/04
Inventor 颜峻石寅
Owner 苏州中科半导体集成技术研发中心有限公司
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