Capacitive Oscillatory Output Circuit for Low-Power Threshold Crossing
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Solution Overview
Problem
Conventional oscillatory signal output circuits face challenges in maintaining transistor operability and output signal generation at low power consumption levels, leading to potential failures due to decreased amplitude and threshold voltage variations.
Innovation Solution
The proposed oscillatory signal output circuit includes a reference oscillatory signal amplifier, an oscillatory signal modification circuit that extracts the AC component and rejects the DC component, and a bias voltage generator that applies bias voltages to ensure the transistors operate effectively, generating a rectangular wave output signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the electric power consumption of the amplifier is reduced to achieve low power consumption operation, then the power consumption is reduced, but the amplitude of the output signal from the amplifier decreases causing the transistor to become inoperable
Solution Approach 1:
A capacitor is introduced as an intermediary element between the amplifier output and the transistor input. This capacitor blocks the DC component while allowing the AC signal component to pass through, effectively decoupling the DC bias requirements from the AC signal transmission. This enables the transistor to operate reliably even when the amplifier operates at low power levels with reduced output amplitude.
Solution Approach 2:
The DC component is extracted and removed from the amplifier output signal path by using the capacitor's blocking property. By separating the AC signal component from the DC component, the circuit allows the AC signal to be transmitted to the transistor without being affected by DC level variations, ensuring transistor operability independent of amplifier power consumption levels.
2Use of energy by moving object
If the amplitude of the output signal from the amplifier is reduced due to low power consumption, then the power consumption is reduced, but the signal may not overcome the threshold voltage of the transistor
Solution Approach 1:
The capacitor serves as a mediator that selectively transmits only the AC signal component while blocking DC components. This ensures that the transistor receives a clean AC signal that can properly cross its threshold voltage for operation, even when the overall signal level is reduced due to low power consumption operation of the amplifier.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables transistors to operate reliably and produce a large gain output signal even at low power consumption, ensuring the output signal is generated effectively as a rectangular wave.
Implementation Method 1
an oscillatory signal modification circuit generating a plurality of modification oscillatory signals with the DC component of the amplified reference oscillatory signal rejected and the AC component of the amplified reference oscillatory signal extracted
Data Source
AI summary
Oscillatory signal output circuitry includes a bias circuit generating a bias voltage, which is applied to an amplifier and an oscillatory circuit to generate an oscillatory signal. The oscillatory signal is capacitively coupled and level-shifted up by the bias voltage to produce output signals. The produced output signals are operatively applied to PMOS and NMOS transistors of an output part. When the voltages of the output signals decrease at the same time, the drain current of the NMOS transistor decreases to output a high level. When the voltages of the output signals increase at the same time, the drain current of the NMOS transistor increases to output a low level. Therefore, the output part attains its large gain, and is ensured to operate to develop the output signal. A variation in threshold voltage would cause the bias voltages to change accordingly, thus being ensured to output the output signal.