Divide-by-N and divide-by-N/N+1 prescalers based on a shift register and a multi-input NOR gate

作者：Hwang Seon Woo^*; Moon Yongsam

来源：IEICE Electronics Express, 2012, 9(20): 1611-1616.

DOI：10.1587/elex.9.1611

• divider
• prescaler
• dual-modulus divider
• linear feedback shift register
• PLL

This paper describes the architecture of a divide-by-N prescaler and a divide-by-N/N + 1 dual-modulus prescaler based on a shift register and a multi-input NOR gate. The divide-by-N prescaler has a circuit style similar to a linear feedback shift register (LFSR), except for the fact that a multi-input NOR gate is used instead of XOR gates. This architecture can be applied to various division ratios of N %26gt;= 2 by changing the numbers of flip-flops and NOR-gate inputs according to specific rules, which will be explained in this paper. The state of the prescaler runs through the correct loop without requiring a reset signal or an initialization circuit.

• 出版日期2012