Process Variation Aware Wide Tuning Band Pass Filter for Steep Roll-Off High Rejection

Algorithm 1

A BPF design to meet the specified center frequency and bandwidth.

Given: BPF (Figure 1) with NMOS ( to ), inductors (, , ), capacitors (, , , and ),

current sources (, , ), power (pw)

Input: and

Objective: BPF to meet a specified center frequency and bandwidth

Output: NMOS sizes, capacitors and inductors value

Design approach: //BPF design to meet the specified center frequency and bandwidth//

(1) Specify DC power (pw₀), center frequency (), bandwidth (BW₀);

(2) Calculate , and based on pw₀;

(3) Set , , based on , and ;

(4)  Set initial value , and ;

(5)   Given , , , , , and ,

    set and to make a little greater than and make a little greater than ;

    set to make ;

(6)   

(7)   while () //Optimize , , in iterations

(8)      ;

      ;

(9)        do DC simulation;

(10)      if /pw > 0.01 then and go to Step (7);

(11)       else exit;

(12)      end if}

(13)   adjust , , , , , ;

     do AC simulation; //find

(14)   If then go to Step (17)

(15)   else go to Step (13)

(16)   end if;

(17)   adjust ;

(18)   do AC simulation; //find BW

(19)   If /BW₀ < 0.01 then exit;

(20)  else go to Step (17)

(21)   end if;