Capacitor Simulation Transistor Charging Circuit for PLL Miniaturization
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Solution Overview
Problem
Conventional PLL circuits require large capacitors for stabilizing currents, which occupy significant area and hinder miniaturization in modern electronic devices, as they are inefficient in charging and discharging processes without capacitors.
Innovation Solution
A charging/discharging circuit using capacitor simulation transistors instead of traditional capacitors, comprising a connection terminal, a reference current providing module, an up current module, and a down current module with switch and bias transistors, allowing efficient charging and discharging without the physical presence of capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional capacitors are used for stabilizing currents in charge pump, then current stability is improved, but circuit area increases significantly
Solution Approach 1:
The patent creates a functional copy of capacitor behavior using transistor circuits. The compensation circuit replicates the current stabilization function of physical capacitors through active transistor-based current mirroring and compensation mechanisms, eliminating the need for large physical capacitor components while maintaining the same electrical function.
Solution Approach 2:
The patent replaces passive mechanical/electrical capacitor components with active transistor-based electronic circuits. By substituting the physical capacitor structure with transistor switching and current mirroring circuits, the system achieves the same current stabilization effect without the area penalty of physical capacitors.
2Area of stationary object
If capacitors are removed from charge pump, then circuit area is reduced, but charging and discharging efficiency deteriorates
Solution Approach 1:
The patent implements self-service through automatic current compensation mechanisms. The compensation circuit continuously monitors and adjusts current levels without external intervention, maintaining efficient charging and discharging operations. The transistor-based circuit automatically regulates current flow to replace the function previously provided by capacitors.
Solution Approach 2:
The patent employs feedback mechanisms where the compensation circuit monitors current variations and adjusts transistor switching accordingly. This closed-loop control ensures that charging and discharging efficiency is maintained by dynamically responding to circuit conditions, replacing the passive stabilization that capacitors provided.
Data Source
AI summary
A charging/discharging circuit includes a connection terminal, a reference current providing module, an up current module and a down current module. The down current module includes: a first switch module, having a first control terminal, for receiving the down signal to determine whether the first switch module is turned on; a first bias transistor, having a first terminal coupled to the connection terminal, a second terminal coupled to the first switch module, and a control terminal coupled to the reference current providing module; and a first capacitor simulation transistor, having a first terminal and a second terminal coupled to the control terminal of the first switch module, and a control terminal coupled to the control terminal of the first bias transistor.