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Capture range control mechanism for voltage controlled oscillators

A voltage-controlled oscillator, oscillator technology, applied in the direction of power oscillator, automatic power control, electrical components, etc., can solve problems such as changing the oscillation frequency of the oscillator

Inactive Publication Date: 2004-11-03
ZARLINK SEMICON LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods allow the construction of the VCO to be adjusted for manufacturing variations in the VCO, and can compensate for changes in environmental conditions in circuit operation, such as temperature changes, but have the disadvantage of abruptly changing the oscillations of the oscillator when capacitors are added or removed frequency
This patent requires the implementation of a counter and an operational amplifier

Method used

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  • Capture range control mechanism for voltage controlled oscillators
  • Capture range control mechanism for voltage controlled oscillators
  • Capture range control mechanism for voltage controlled oscillators

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Embodiment Construction

[0021] figure 1 is the block diagram of a common phase-locked loop. The phase-locked loop comprises: a phase detector 10 receiving a reference signal and a feedback signal at its input; a charge pump receiving the output of the phase detector 10, which converts the detected phase difference into During the varying source or sink current, a voltage controlled oscillator 16 whose output is fed back to the input of the phase detector 10 via a frequency divider 18 . Loop filter 14 includes resistor 20 and capacitor 22 .

[0022] figure 2 A voltage controlled oscillator 16 is shown comprising: a pair of transistors 30, a constant current source 32, a resistor 34, a pair of varactor diodes 36 (variable capacitance capacitors), a pair of inductors 38, and a pair of capacitors 40. Input 42 receives control voltage V from loop filter 14 ctl . During operation, the control voltage V ctl Changing the capacitance of the varactor diode 36 in the LC circuit changes the output freque...

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Abstract

A voltage controlled oscillator generates an output signal whose frequency varies as a first function of a control voltage applied to a control terminal. The voltage controlled oscillator has a wide range of frequency of operation. A gain adjust circuit adjusts the gain of the voltage controlled oscillator such that the first function varies as a second function of the gain. In a preferred embodiment the gain adjust circuit includes a variable impedance that may be external or integrated onto a common chip with the oscillator core.

Description

technical field [0001] The present invention relates to voltage controlled oscillator circuits, such as those used in phase locked loops fabricated as monolithic integrated circuits. Background technique [0002] The oscillation frequency of an oscillator is usually adjusted with a control voltage. Such oscillation is called a voltage controlled oscillator (VCO). In some implementations, the control voltage varies the current source for one and all of the plurality of inverters connected in series. In other implementations, the control voltage changes the capacitance of the inductance / capacitance resonator. [0003] In a typical integrated circuit implementation, the circuit element that has a capacitance that varies with the control voltage is a collector varactor diode. It can be a diode acting as a variable capacitor whose junction capacitance varies according to the reverse bias voltage, or a MOS varactor whose enhancement or depletion region is controlled by the gate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/12H03L7/093H03L7/099
CPCH03B5/1243H03B5/1209H03L7/093H03B5/1231H03L7/099
Inventor 兰吉特·辛格优素福·福赞西蒙·约翰·斯基尔斯坎哈齐姆·阿卜杜勒-马吉德
Owner ZARLINK SEMICON LTD
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