Binary frequency shift keying signal transmitting modulator with transmitting modulation compensator

A technology of transmission modulation and frequency shift keying, which is applied to the shaping network, frequency modulation carrier system, and baseband system components in the transmitter/receiver, and can solve the problem of increased modulation frequency deviation

Inactive Publication Date: 2010-07-21
武汉凯珈光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For a determined V tune , by V preTX The modulation coefficient of the controlled varactor itself varies with V preTX Increase and decrease, that is, the modulation voltage V corresponding to the data "0" low The corresponding modulation coefficient is larger, and the modulation voltage V corresponding to the data "1" high The corresponding modulation factor is smaller; on the other hand, due to V tune The equivalent parasitic capacitance of the controlled set of varactors varies with V tune increases and decreases, so if V high and V low are definite values ​​respectively, and their corresponding modulation coefficients vary with V tune increases with increasing, causing the modulation frequency deviation to vary with V tune increase and increase

Method used

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  • Binary frequency shift keying signal transmitting modulator with transmitting modulation compensator
  • Binary frequency shift keying signal transmitting modulator with transmitting modulation compensator
  • Binary frequency shift keying signal transmitting modulator with transmitting modulation compensator

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Embodiment Construction

[0017] The specific implementation of the binary frequency shift keying signal transmission modulator with transmission modulation compensator of the present invention will be further described in detail in conjunction with the accompanying drawings.

[0018] like figure 2 Shown, the reference clock frequency (f ref ) input to the first input of the frequency and phase detector, the output of the frequency and phase detector is connected to the input of the charge pump; the output of the charge pump is connected to the input of the loop filter; the loop filter The output end of the voltage-controlled oscillator is connected with the first input end of the voltage-controlled oscillator and the first input end of the launch preprocessor; the output end of the voltage-controlled oscillator is connected with the input end of the programmable frequency divider; the programmable divider The output terminal of the frequency detector is connected with the second input terminal of th...

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Abstract

The present invention discloses binary system FSK signal emission modulator having emission modulation compensator. It contains in current emission modulation scheme adding a two way voltage converter composed emission modulation compensator, two way voltage converter respectively to make modulation voltage Vmod_low enlarge with Vtune enlargement, modulation voltage Vmod_high reducing with Vtune enlargement, thereby reducing modulating frequency deviation variation along with different Vtune, to make modulating frequency deviation relatively constant.

Description

technical field [0001] The invention relates to a wireless communication transmitting device, in particular to a binary frequency shift keying signal transmitting modulator used in a wireless transmitting device. Background technique [0002] BFSK (Binary Frequency-Shift Keying, Binary Frequency-Shift Keying) transceiver device is a relatively low-cost transceiver device in wireless communication. The basic idea of ​​its transmission modulation is to directly modulate the transmission signal frequency with data, data "0" and data "1" corresponds to different transmission frequencies, and the demodulator in the receiving device uses this modulation frequency deviation to demodulate the received signal. Existing transmit modulation schemes such as figure 1 As shown, the VCO (Voltage Controlled Oscillator, Voltage Controlled Oscillator) has two modulation ports, one is controlled by the output V of the phase-locked loop loop filter tune control, the other is transmitted by th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/12H04L25/03
Inventor 刘欢艳张钊锋
Owner 武汉凯珈光电科技有限公司
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