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Oscillator circuit

A technology of oscillators and oscillation circuits, applied in the field of high-frequency oscillator circuits and oscillator circuits, can solve problems such as increasing frequency restrictions, and achieve the effect of improving phase noise and increasing tuning range

Inactive Publication Date: 2006-03-22
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, there is a need to provide an improved oscillator circuit that increases the frequency limitation of the prior art

Method used

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  • Oscillator circuit
  • Oscillator circuit
  • Oscillator circuit

Examples

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Embodiment Construction

[0031] figure 1 An oscillator circuit 100 having a resonator 102 is shown. In the example considered here, the resonator 102 has an inductor 104 symmetrically coupled to a current source 106 supplying a current Id; another inductor 104 symmetrically coupled to the supply voltage. The resonator 102 has a varactor 108 with a control terminal 110 for applying a tuning voltage Vtune for frequency modulation. Capacitor 112 is coupled in series with varactor 108 . Preferably, capacitor 112 has a high value and thus a low series resistance. Therefore, the anode of the varactor 108 is DC grounded through the high ohmic series resistor 114, and the cathode, the control terminal 110, can be tuned from zero volts to the supply voltage. The bottom plate of the varactor is a common mode. This technique allows the largest possible tuning range within the mains voltage. Resonator 110 is of the common cathode type, whereby the anode of resonator 102 is coupled to emitter followers 116 an...

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Abstract

Present invention relates to an oscillator circuit comprising: resonator means ( 102 ) and, first and second emitter followers ( 116, 118 ) being symmetrically coupled to the resonator means and been connected to further emitter followers ( 120, 122 ) for providing capacitive loading.

Description

technical field [0001] The invention relates to the field of oscillator circuits, in particular not limited to the field of high-frequency oscillator circuits with oscillation frequencies in the GHz range. Background technique [0002] A large number of oscillator circuits operating in the GHz range are known from the prior art. From K.Ettinger, M.Bergmair, H.Pretl, W.Thomann, J.Fenk, R.Weigel, "AnIntegrated 20GHz SiGe Bipolar Differential Oscillator with HighTuning Range", Proceedings of the 2000 Bipolar / BiCMOS Circuits and Technology Meeting(BCTM) , Minneapolis, 2000, pp. 161-163. ISBN 0-7803-6384-1 An oscillator circuit with a tuning range of 14GHz-21.5GHz is known. This oscillator circuit is implemented in SiGe bipolar technology and features an oscillation loop formed by the on-chip strip inductor and the parasitic capacitance of the oscillator transistor. The output buffer is inductively coupled to the tank tank. The oscillator core consists of an LC tank tank and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/12H03B1/00
CPCH03B5/1243H03B27/00H03B5/1231H03B2201/0208H03B2200/0074H03B5/1218
Inventor H·韦恩斯特拉E·范德海登W·L·陈
Owner NXP BV
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