cp电荷泵veriloga
时间: 2023-08-17 14:15:49 浏览: 163
cpu_verilog
CP电荷泵是数字锁相环(Digital Phase-Locked Loop,DPLL)中的一个重要组成部分。它的作用是根据相位/频率检测器(PFD)的输出信号,通过控制电荷泵的电流来调整环路滤波器(Loop Filter)的输出电压,从而影响压控震荡器(Voltage Controlled Oscillator,VCO)的频率。在Verilog-A中,可以使用以下代码来实现CP电荷泵的功能:
```verilog
module cp_charge_pump (
input clk,
input reset,
input pfd_out,
output reg cp_out
);
always @(posedge clk or posedge reset) begin
if (reset) begin
cp_out <= 0;
end else begin
if (pfd_out) begin
cp_out <= cp_out + 1; // 增加电荷泵输出电流
end else begin
cp_out <= cp_out - 1; // 减小电荷泵输出电流
end
end
end
endmodule
```
上述代码中,`clk`是时钟信号,`reset`是复位信号,`pfd_out`是PFD的输出信号,`cp_out`是电荷泵的输出电流。当PFD的输出信号为高电平时,电荷泵的输出电流增加;当PFD的输出信号为低电平时,电荷泵的输出电流减小。通过调整电荷泵的输出电流,可以实现对环路滤波器输出电压的调节,从而控制VCO的频率。
#### 引用[.reference_title]
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