7

Analog Test Circuits

FIGURE 4. CROSSTALK BETWEEN TWO SWITCHES TEST CIRCUIT

FIGURE 5. FREQUENCY RESPONSE TEST CIRCUIT

FIGURE 6. TOTAL HARMONIC DISTORTION TEST CIRCUIT

FIGURE 7. CONTROL-TO-SWITCH FEEDTHROUGH NOISE

TEST CIRCUIT

FIGURE 8. SWITCH OFF SIGNAL FEEDTHROUGH

0.1

µF

RC

SWITCH

ON

R

RC

SWITCH

OFF

dB

METER

R = 50

Ω

C = 10pF

R

0.1

µF

50

Ω

10pF

SWITCH

ON

dB

METER

10

µF

10k

Ω

50pF

SWITCH

ON

DISTORTION

METER

SINE

WAVE

SWITCH

ALTERNATING

ON AND OFF

50% DUTY

CYCLE

SCOPE

E

50pF

600

Ω

600

Ω

0.1

µF

RC

SWITCH

OFF

dB

METER

R

R = 50

Ω

C = 10pF

Test Circuits and Waveforms

FIGURE 9. HC TRANSITION TIMES AND PROPAGATION

DELAY TIMES, COMBINATION LOGIC

FIGURE 10. HCT TRANSITION TIMES AND PROPAGATION

DELAY TIMES, COMBINATION LOGIC

90%

50%

10%

50%

10%

INVERTING

OUTPUT

INPUT

GND

90%

2.7V

1.3V

0.3V

1.3V

10%

INVERTING

OUTPUT

INPUT

GND

3V

90%

CD54HC4066, CD74HC4066, CD74HCT4066