Method for quickly tuning on-chip variable filter
A filter and variable technology, applied in the direction of frequency selection two-terminal-to-network, multi-terminal-to-network, etc., can solve the problems of insufficient tuning stabilization time, long register configuration time, long oscillation stabilization time, etc., to improve anti-interference ability. , flexible and efficient control method, the effect of improving the dynamic range
Pending Publication Date: 2021-03-19
浙江集速合芯科技有限公司
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Problems solved by technology
On-chip variable filters generally change LC array parameters through SPI or UART serial configuration registers. When the number of configuration registers is large, the register configuration time is very long, and the serial configuration order of the filter will lead to long oscillation stabilization time, and the final tuning The stabilization time is very slow, such as tens or even hundreds of milliseconds, this tuning stabilization time does not meet the system requirements of fast frequency hopping
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[0042] Take 2 filter mode debugging and configuration of an on-chip variable filter as an example. The 2 filter modes are:
[0043] Filter mode 1: IF 315MHz, -3dB bandwidth is a bandpass filter of 3MHz;
[0044] Filter mode 2: IF 450MHz, -3dB bandwidth is a bandpass filter of 10MHz.
[0045] Firstly, debug the two filter modes separately. The on-chip variable filter needs 60 byte registers to complete the filter bandwidth and IF tuning configuration. For example, the register address corresponding to the first-level Q value in debug filter mode 1 is 0x08, and the corresponding configuration value for simulation is 0x05. Assuming that the interface uses the SPI protocol, the CSB chip select signal is used as the start and end of reading and writing, and the write command in debug mode is spid w 0x08 0x05; the corresponding timing diagram is as follows Figure 5 shown.
[0046] The clock of SPI is sampling on the rising edge, and SDIO sends instructions. The first bit is the...
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The invention relates to a method for quickly tuning an on-chip variable filter. Register configuration words needed by an on-chip variable filter corresponding to all filter modes are stored in a chip, configuration of all registers is synchronously completed through a global configuration pin, and the method relates to an interface module, a decoding state machine module, a configuration word storage module, an address distribution module and a configuration word latch module. Through a register mode indexing mode, the configuration time expenditure of an upper computer through a serial interface is greatly reduced, the tuning stabilization time of a microsecond-level filter can be realized, and the anti-interference capability of the system is improved. Meanwhile, the interference of digital pulses on analog signals of the filter caused by frequent reading and writing of a chip IO interface is avoided, the dynamic range of a transceiving link is improved, and the anti-interference capability of the system is further improved. The invention provides a flexible and efficient control method for the on-chip variable filter of the next generation of wireless communication.
Description
technical field [0001] The invention relates to the field of chip control, in particular to a method for fast tuning of an on-chip variable filter. Background technique [0002] With the development of wireless communication technology, spectrum resources are becoming more and more tight. Wireless communication systems need to use filters to eliminate various electromagnetic signal interference. Immunity to interference, which requires the use of filters in the RF / analog domain to filter out out-of-band interference. [0003] Traditional anti-jamming RF / analog systems use filter banks, and select filter channels through RF switches to realize frequency hopping selection. However, this method has the problems of large size and weight of filter banks, and inflexible expansion and jump combinations. In order to achieve more flexible filter bandwidth and filter intermediate frequency selection, the on-chip variable filter can be implemented in the form of a chip, and the bandwi...
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IPC IPC(8): H03H11/04
CPCH03H11/04
Inventor 刘东栋聂辉兰冰俞天成黄振华
Owner 浙江集速合芯科技有限公司