ADC project using specific frequency
How to make ADC project using specific frequency? verilog code and complete information
Verilog-A code for Ideal ADC of 10 bit:
// Description: Ideal Analog to Digital Converter
// Generates an N bit ADC.
// - selectable logic output levels
// - model valid for negative values of vmin
// - adjustable conversion time, and rise/fall time
// This model is an example, provided "as is" without express
or
// implied warranty and with no claim as to its suitability
for
// any purpose.
//
// PARAMETERS:
// slack = The smallest time interval considered negligible
for
// cross event on clock [S]
// tconv = Delay from threshold crossing to output change [S]
// trise = Rise time for digital output signals [S]
// trise = Rise time for digital output signals [S]
// vmax = ADC Full scale output voltage [V]
// vmin = ADC Zero scale output voltage [V]
// vone = The voltage of a logical 1 on digital outputs [V]
// vth = Threshold value of clock signal [V]
// vzero = The voltage of a logical 0 on digital outputs [V]
//
`include "discipline.h"
`include "constants.h"
`define NUM_ADC_BITS 10
module adc_8bit (vin, clk, data);
input vin, clk;
electrical vin, clk;
output [`NUM_ADC_BITS-1:0] data;
electrical [`NUM_ADC_BITS-1:0] data;
parameter real vmax = 0.750;
parameter real vmin = 0.250;
parameter real one = 1.8;
parameter real zero =0;
parameter real vth = 0;
parameter real slack = 0.5p from (0:inf);
parameter real trise = 1.0p from (0:inf);
parameter real tfall = 1.0p from (0:inf);
parameter real tconv = 0.5p from [0:inf);
parameter integer traceflag = 1;
real sample, vref, lsb, voffset;
real vd[0:`NUM_ADC_BITS-1];
integer ii, binvalue;
analog begin
@(initial_step or initial_step("dc", "ac", "tran", "xf"))
begin
vref = (vmax - vmin) / 2.0;
lsb = (vmax - vmin) / (1 << `NUM_ADC_BITS) ;
voffset = vmin;
if (traceflag)
$display("%M ADC range ( %g v ) / %d bits = lsb %g volts.\n",
vmax - vmin, `NUM_ADC_BITS, lsb );
generate i ( `NUM_ADC_BITS-1, 0) begin
vd[i] = 0 ;
end
end
@(cross ( V(clk)-vth, 1, slack, clk.potential.abstol)) begin
binvalue = 0;
sample = V(vin) - voffset;
for ( ii = `NUM_ADC_BITS -1 ; ii>=0 ; ii = ii -1 ) begin
vd[ii] = 0;
if (sample > vref ) begin
vd[ii] = one;
sample = sample - vref;
binvalue = binvalue + ( 1 << ii );
end
else begin
vd[ii] = zero;
end
sample = sample * 2.0;
end
if (traceflag)
$strobe("%M at %g sec. digital out: %d vin: %g (d2a: %g)\n",
$abstime, binvalue, V(vin), (binvalue*lsb)+voffset);
end
generate i ( `NUM_ADC_BITS-1, 0) begin
V(data[i]) <+ transition ( vd[i] , tconv, trise, tfall );
end
end
endmodule
`undef NUM_ADC_BITS
The code is compiling perfectly and the ADC symbol is getting generated.
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