Analog Switches Operate With 3
abstract: by adding a voltage doubler and voltage inverter, a single 3v or 5v power supply can produce the voltages necessary to improve the performance on a dual voltage analog switch. with the higher power supplies and wider range, the on resistance and timing performance are enhanced.
by adding a single component to a 3v-only or 5v-only board, you can operate conventional cmos analog switches with performance approaching that specified with ±15v supplies. this means fast switching, low on-resistance, cmos/ttl compatibility, low power consumption, and a signal range (±vcc) that exceeds the input supply range (vcc to ground).
simply add a charge-pump voltage converter (ic1), which produces ±2vcc outputs from a vcc input. these unregulated voltages ensure reliable switch operation for vcc levels as low as 3v. logic thresholds for the switch remain unaffected.
figure 1. the charge pump (ic1) provides a local bipolar power supply for the cmos analog switch (ic2).
a vcc of 3v (for instance) produces ±6v rails for the switch (ic2), resulting in on-resistance <30ω w, switching times <200ns, leakage <0.1na, and icc current <0.5ma. raising vcc to 5v produces ±10v rails, resulting in on-resistance <20ω w, switching times <150ns, leakage <0.4na, and icc current <1.3ma.
ic1 can easily power additional switches and/or low-power op amps, but more than a few milliamps of load current degrades performance by lowering the unregulated supply rails.
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by adding a single component to a 3v-only or 5v-only board, you can operate conventional cmos analog switches with performance approaching that specified with ±15v supplies. this means fast switching, low on-resistance, cmos/ttl compatibility, low power consumption, and a signal range (±vcc) that exceeds the input supply range (vcc to ground).
simply add a charge-pump voltage converter (ic1), which produces ±2vcc outputs from a vcc input. these unregulated voltages ensure reliable switch operation for vcc levels as low as 3v. logic thresholds for the switch remain unaffected.
figure 1. the charge pump (ic1) provides a local bipolar power supply for the cmos analog switch (ic2).
a vcc of 3v (for instance) produces ±6v rails for the switch (ic2), resulting in on-resistance <30ω w, switching times <200ns, leakage <0.1na, and icc current <0.5ma. raising vcc to 5v produces ±10v rails, resulting in on-resistance <20ω w, switching times <150ns, leakage <0.4na, and icc current <1.3ma.
ic1 can easily power additional switches and/or low-power op amps, but more than a few milliamps of load current degrades performance by lowering the unregulated supply rails.
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