Low Voltage Swing Logic - PowerPoint PPT Presentation

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Low Voltage Swing Logic

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  1. Low Voltage Swing Logic • Large Diffusion Connected Network (DCN) produces differential small signals. • Extremely high-performance;Expensive reset network, reset cycle, huge load on clock.

  2. Current Mode Differential Logic • Utilize current mode logic to get stable low-voltage swing. S0 S1 SA S1’ Xs Rs CDL • Shunt transistors and resistors replace reset network. • Small transistor count, no reset, small dynamic power, small clock load.

  3. CMDL Waveform

  4. Current Mode vs. Voltage Mode • Smaller shunt resistor, faster response. Limited by threshold voltage of sense amplifier. Time Constant Voltage Mode Current Mode

  5. CMDL Design • Basic design rules: • Any differential input pair must be connected through a shunt resistor or a closed transistor. (No full voltage swing in the circuit) • For any differential output pair, only one shunt resistor or closed transistor on the active path.(Differential output signal can be detected) • Applicable to extremely high performance low power datapath designs, such as MUX, barrel shifter and carry-skip adder.

  6. Preliminary Results DELAY AND POWER COMPARISON BETWEEN CMDL AND LVS CIRCUITS