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Method and equipment for driving receiver

A technology for receivers and equipment, applied in the direction of amplification control, automatic power control, and adjustment of resonant circuits, etc., can solve problems such as hindering the measurement of received signals, improve phase noise response, reduce phase noise, and reduce oscillator pull Effect

Inactive Publication Date: 2003-09-24
INTERDIGITAL CE PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, for this approach, the inventors have realized that whenever the oscillator frequency is a fraction or multiple of the received frequency, there can also be another received frequency which acts as a kind of a counter to the received interfering frequency. effect, thus causing the oscillator to pull, which seriously hampers the determination of the received signal

Method used

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  • Method and equipment for driving receiver
  • Method and equipment for driving receiver
  • Method and equipment for driving receiver

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Embodiment Construction

[0019] figure 1 Represents a block diagram of the present invention. The reception channel with an input frequency between 950 and 2150 MHz appears in the AGC (automatic gain control) regulating amplifier stage AGC and is passed via the latter to the selection means SM. The selection means SM is, for example, a bandpass filter which ideally selects only one selection channel, but usually allows several channels to pass. The signal processed in this way is then passed to a mixer M. The mixer mixes the input signal with a signal from the oscillator OSC which has been divided or multiplied by a frequency divider or multiplier MT. Then, the output signals I and Q are obtained at the mixer. The task of the control unit SE is to drive the amplifier stage AGC, the selection means SM and the oscillator OSC according to the signals received.

[0020] Since the signal of interest is downconverted but not to the IF in the direct conversion mixing stage, the frequency coming from the ...

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Abstract

A method and apparatus for driving a receiver stage. The method of the invention for driving a receiver stage comprising selection means, a frequency divider or multiplier, a control unit and an oscillator, the method is characterized by adjusting the selection means so that whenever the oscillator frequency is received When the interference frequency is a fraction or several times of the interference frequency, a selection device is used to attenuate the received interference frequency. This method reduces oscillator pull.

Description

technical field [0001] The invention relates to a method of driving a receiver stage. Background technique [0002] Oscillator phase noise is an unwanted side effect that occurs when an oscillator is intended to cover a large frequency range. On the one hand, the oscillator phase noise can be improved by optimizing the associated PLL (Phase Locked Loop) circuit. On the other hand, for large frequency ranges, oscillator noise can be reduced by using two separate oscillators. Therefore, the frequency range of these oscillators is small enough to improve phase noise. [0003] However, for this approach, the inventors have realized that whenever the oscillator frequency is a fraction or multiple of the received frequency, there can also be another received frequency which acts as a kind of a counter to the received interfering frequency. effect, thus causing the oscillator to pull, which seriously hampers the determination of the received signal. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H03G3/20H03J1/00H03J5/24H03L7/08H04B1/12H04B1/14H04B1/16H04B1/18H04B1/26
CPCH03G3/3036
Inventor 赫伯特·普林斯克劳斯·克莱门斯
Owner INTERDIGITAL CE PATENT HLDG