Programmable Frequency Divider Circuit. The programmable frequency divider consists of a dual modulus prescaler dmp a programmable p counter and a swallow s counter. The prl 257 8 is an ac coupled input manually programmable two phase frequency divider with two sets of complementary necl outputs.
The circuit can be pro grammed to divide from n 1 to n 4 in the 400 mhz to 6 ghz input frequency range. It has a common divide by 8 pre scalar front end followed by two banks of independent manually programmable dividers φ1and φ2. It is a key component of a frequency synthesizer.
The dual modulus prescaler is based on both synchronous and asynchronous divider which scales the input frequency to a lower frequency to ease the complexity of asynchronous resettable modulo pand modulo scounters.
It has a common divide by 8 pre scalar front end followed by two banks of independent manually programmable dividers φ1and φ2. It is a key component of a frequency synthesizer. Fractional clock frequency dividers are a special type of divider circuits where the dividing factor is a fraction. The circuit was designed to divide the frequency of a ttl compatible square wave signal which can be programmed with the use of three 7490 to perform the required operation.
