Track-and-Hold Differential Amplifier Resistor Segmentation
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Solution Overview
Problem
The existing track-and-hold circuits face a trade-off between reducing power consumption and maintaining broadband nature, where lowering current through the switch circuit increases power consumption, and increasing load resistor values narrows the bandwidth of the differential amplifier circuit.
Innovation Solution
Incorporating additional resistors in the differential amplifier circuit, such as a third resistor connected between the ends of first and second resistors and the power supply, allows for reduced current flow without impairing the broadband nature by adjusting the potential of the switching transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the resistance values of the load resistors are reduced to secure broadband nature, then the bandwidth is improved, but the power consumption increases due to large current required in hold mode
Solution Approach 1:
The load resistor is segmented into two parts: a first resistor connected to the collector electrode and a second resistor connected to the power supply. This segmentation allows the first resistor to maintain low resistance for broadband performance while the second resistor limits the current in hold mode, resolving the contradiction between bandwidth and power consumption.
Solution Approach 2:
The invention changes the resistance parameter distribution by introducing a series connection of two resistors with different resistance values. The first resistor has low resistance to maintain bandwidth, while the second resistor has high resistance to limit power consumption in hold mode. This parameter change resolves the contradiction by optimizing each resistor's value for its specific function.
2Use of energy by moving object
If the current flowing through the switch circuit is reduced to decrease power consumption, then the power consumption is improved, but the broadband nature is impaired and bandwidth is narrowed
Solution Approach 1:
The load resistor is segmented into two parts: a first resistor connected to the collector electrode and a second resistor connected to the power supply. This segmentation allows the first resistor to maintain low resistance for broadband performance while the second resistor limits the current in hold mode, resolving the contradiction between bandwidth and power consumption.
Solution Approach 2:
The invention changes the resistance parameter distribution by introducing a series connection of two resistors with different resistance values. The first resistor has low resistance to maintain bandwidth, while the second resistor has high resistance to limit power consumption in hold mode. This parameter change resolves the contradiction by optimizing each resistor's value for its specific function.
Data Source
AI summary
Provided is a track-and-hold circuit capable of reducing the power consumption of a differential amplifier circuit while preserving the broadband nature (without narrowing the bandwidth). In the track-and-hold circuit 1 including a differential amplifier circuit 10, a switch circuit 20, and a hold capacitor C21, the differential amplifier circuit 10 includes a first resistor R11 having one end connected to a collector electrode of a first transistor Q11 constituting a differential pair, a second resistor R12 having one end connected to the collector electrode of a second transistor Q12 constituting the differential pair, and a third resistor R13 to which the other end of the first resistor R11 and the other end of the second resistor R12 are connected and which is connected between the other ends and a power supply VCC.