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This article describes a dynamic sense amplifier especially useful with charge-coupled devices which require lower power, and provides higher performance than previously known sense amplifiers.
English (United States)
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High Sensitivity Sense Amplifier
This article describes a dynamic sense amplifier especially useful with
charge-coupled devices which require lower power, and provides higher
performance than previously known sense amplifiers.
The circuit shown in the figure operates as follows: The
device is placed into standby condition prior to its sensing an
input, by biasing node 10 with a positive voltage phi l to cause
transistors T7 and T8 to turn on and to pull up nodes 20 and 21
towards the positive voltage VH and to charge capacitors C20 and C21.
Simultaneously the same positive voltage pulse phi 1 is applied to
nodes 11, 12 and 14. Application of this pulse to node 11 turns on
transistors T9 and T10 and pulls nodes 93 and 94 toward ground
through diode T28. This voltage applied to node 12 of transistor T24
causes transistor T24 to turn on, coupling the voltage source Vref
(node 13) to node 6 which is the gate of transistor T4 and brings the
gate of transistor T4 to approximately 5 volts. The voltage pulse
Phi 1 is also applied to the gate node of transistor T23, causing
node 3 to also rise toward (VH-Vth). Transistor T3 and T4 now turn
on. At this time nodes 4, 5, 93, and 94 are all discharged to
approximately Vth condition via the transistor diode T28. Once all
these nodes are discharged, the positive voltage M1 applied to nodes
10, 11, 12 and 14 is terminated, and nodes 20 and 21 remain charged.
The circuit is now in standby condition, and if an input signal from the device
15 causes charg...