Latch Charge Pump Stabilization Circuit Low Voltage Operation
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Solution Overview
Problem
The existing latch-type charge pump circuits face limitations in operating at low supply voltages, particularly below 1V, due to insufficient current supply and transistor turn-on issues when the supply voltage approaches the threshold voltage, leading to degradation in load current and circuit performance.
Innovation Solution
A latch-type charge pump circuit with a stabilization circuit connected to the enable terminals to maintain constant biasing voltages for latch transistors during charge sharing, ensuring correct turn-on and turn-off, and utilizing a stabilization stage between the intermediate circuit node and enable terminals to control latch transistors for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the supply voltage is reduced below 1V to save power, then power consumption is reduced, but the transistor turn-on fails and current supply becomes insufficient
Solution Approach 1:
The stabilization circuit proactively generates appropriate gate voltages for latch transistors before the charge pump operates at low supply voltage, ensuring transistors can turn on reliably even when Vdd is below 1V. The circuit prepares the necessary voltage conditions in advance to overcome the threshold voltage limitation.
Solution Approach 2:
The stabilization circuit acts as an intermediary between the low supply voltage source and the latch transistors, generating intermediate gate control voltages that are sufficient to turn on the transistors. This mediator circuit enables the transistors to operate reliably despite the low main supply voltage.
2Use of energy by moving object
If the supply voltage approaches the transistor threshold voltage, then power consumption is reduced, but the load current degrades and circuit performance worsens
Solution Approach 1:
The stabilization circuit changes the voltage parameters by generating elevated gate voltages for the latch transistors, allowing them to operate effectively even when the main supply voltage is reduced to below 1V. This parameter transformation enables maintaining load current despite low supply voltage.
3Area of stationary object
If a four-phase charge pump circuit is used to operate at lower frequencies, then area can be reduced, but the operating frequency range is insufficient for high-frequency applications
Solution Approach 1:
The stabilization circuit prepares appropriate biasing voltages in advance, enabling the charge pump to operate reliably at higher frequencies. This preliminary voltage preparation removes the limitation that previously constrained the circuit to lower frequency ranges.
Data Source
AI summary
A latch-type charge pump circuit is provided having first and second charge pump stages interconnected by an intermediate circuit node. The charge pump circuit includes first pump capacitors respectively coupled between first and second enable terminals and respective first inner circuit nodes, second pump capacitors respectively coupled between the second and first enable terminals and respective second inner circuit nodes, latch transistors coupled between each of the first and second inner circuit nodes and the intermediate circuit node, and a stabilization circuit having at least one stabilization stage coupled between the intermediate circuit node and the first and second enable terminals and connected to control terminals of the latch transistors for supplying them with suitable control signals so as to ensure their correct turn-on and turn-off during a charge sharing period of the charge pump circuit.