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A two-point modulation transmitter calibration circuit and calibration method

A technology for calibrating circuits and transmitters, applied in the field of transmitters, can solve the problems of low-pass branch, high-pass branch delay and poor gain matching, etc.

Active Publication Date: 2021-08-24
NATIONZ TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: when the signal is transmitted in the high- and low-pass branches, the delay and gain matching of the low-pass and high-pass branches are not good due to changes in technology, voltage and temperature

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  • A two-point modulation transmitter calibration circuit and calibration method
  • A two-point modulation transmitter calibration circuit and calibration method
  • A two-point modulation transmitter calibration circuit and calibration method

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specific Embodiment

[0058] Step Ⅰ: Battery power-on enable detection. After power-on is detected, the transmitter should be ready to transmit. Before signal communication, the transmitter needs to be calibrated to ensure communication quality.

[0059] Step Ⅱ: If figure 1 As shown, set the integer frequency division ratio and fractional frequency division ratio control word corresponding to the operating frequency of the phase-locked loop through the RF Channel, and enable the module of the open-loop path of the phase-locked loop.

[0060] Step Ⅲ: If figure 1 As shown, closing S0 and opening S1 cuts off the PLL loop, and at the same time opens S2 to carry out the automatic frequency control (AFC) process. At this time, the loop is formed by VCO, Pre-Divider 2, Buffer, and Digital / Analog AFC The circuit realizes the rough adjustment of the working frequency of the phase-locked loop, so that the phase-locked loop is locked within a certain error range of the working frequency point, and waits fo...

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Abstract

The present invention relates to a two-point modulation transmitter calibration circuit and a calibration method, the circuit comprising: a two-point modulation phase-locked loop system, a signal input circuit, a power amplifier and a gain self-calibration circuit; the method steps include: a pending phase-locked loop After locking in the working frequency, transmit the calibration data, take the low-pass branch as the reference, calculate the gain difference between the high and low channels through the gain self-calibration circuit, and use the special calibration timing to adjust the control word of the low-pass filter in an opposite direction, changing the number The output amplitude of the analog-to-analog converter realizes the gain matching of the two branches, and the calibration process is completed by configuring the delay control word. The invention not only realizes delay matching calibration, but also has the function of automatic gain calibration, and also solves the problems of traditional two-point modulation frequency offset calibration resource consumption, long calibration time, and frequency offset caused by drastic temperature changes.

Description

technical field [0001] The invention relates to a transmitter suitable for low power consumption, in particular to a two-point modulation transmitter calibration circuit and calibration method. Background technique [0002] There are three main types of direct transmitters based on phase-locked loops: (1) out-of-band transmitters based on phase-locked loops; (2) in-band transmitters based on phase-locked loops; (3) two-point transmitters based on phase-locked loops Modulate the transmitter. The two-point modulation transmitter based on the phase-locked loop is more suitable for high-quality transmission and low power consumption because it overcomes the weak anti-interference ability of the out-of-band transmitter and breaks the limitation of the in-band transmitter by the bandwidth of the phase-locked loop. wireless communication device. [0003] The most common architectures for phase-locked loop-based two-point modulated transmitters, such as Figure 7 As shown, the two...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/11
CPCH04B17/11H03L7/099
Inventor 赵辉何国军曾军
Owner NATIONZ TECH INC
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