FSK receiver

一种接收器、接收方法的技术，应用在接收器领域，能够解决检波困难、可检波范围小等问题，达到高灵敏度接收的效果

Inactive Publication Date: 2009-09-09
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the modulation sensitivity is low, the output voltage difference ΔV is small, which makes detection difficult
However, when the modulation sensitivity is too high, the detectable range becomes smaller

Method used

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  • FSK receiver
  • FSK receiver
  • FSK receiver

Examples

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Embodiment Construction

[0024] Specific exemplary embodiments to which the present invention is applied will be described in detail with reference to the accompanying drawings. The present exemplary embodiment is an embodiment in which the present invention is applied to an FSK (Frequency Modulation: Frequency Shift Keying) receiver.

[0025] figure 1 is a block diagram showing a receiver according to an exemplary embodiment of the present invention. The FSK receiver 100 includes: a first stage low noise amplifier 1, a mixer 2, an IF (intermediate frequency) bandpass filter (BPF) 3 used as a passband limiter to limit the passband of the IF signal, an IF limiter amplifier 4. FSK detector 5 that detects the IF signal passing through the IF BPF 3 to generate a detected signal, a comparator 6, a PLL 7 that generates a local signal, and a control block that controls the pass bandwidth of the IF BPF 3 and the modulation sensitivity of the FSK detector 5 8. The control block 8 includes an external adjus...

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PUM

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Abstract

A receiver includes a band-pass filter that limits a passband of an IF (Intermediate Frequency) signal, an FSK detector that detects the IF signal passing through the band-pass filter to generate a detection signal, and a control block that controls a modulation sensitivity of the FSK detector and a pass bandwidth of the band-pass filter, in which the control block controls the modulation sensitivity of the FSK detector according to the pass bandwidth of the band-pass filter.

Description

technical field [0001] The present invention relates to a receiver having an intermediate frequency, such as a single conversion system and a low intermediate frequency (low-IF) system, and more particularly, to a receiver utilizing an IF bandpass filter and an FSK detector. Background technique [0002] In recent years, reduction in size and power consumption of communication devices such as ISM (Industrial Scientific Medical) bands or designated low-power radio devices has been required, and many functions have been handled by ICs (Integrated Circuits). Likewise, receivers used with them also have functional circuits made into ICs, such as LNAs, mixers, IF filters, oscillators, PLL (Phase Locked Loop) frequency synthesizers, demodulators, and so on. Furthermore, in receivers mainly used for Remote Keyless Entry (RKE) / Tire Pressure Sensor (TPMS: Tire Pressure Monitoring System), many IF filters have been incorporated. Accordingly, the IF frequency has been changed from the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/16H04B1/00
CPCH03J3/08H03J7/04H04L27/144H03D3/06
Inventor 铃木茂弥
Owner RENESAS ELECTRONICS CORP
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