Differential Charge Pump With Voltage Doubler for Wider PLL Range
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Solution Overview
Problem
Traditional charge pump circuits in PLL and DLL systems are limited in their output voltage range, restricting the range of output frequencies that can be generated by VCO circuits.
Innovation Solution
A differential signal driven direct-current voltage generating device comprising a charge pump unit, loop filter unit, voltage doubler unit, and spur filter unit, utilizing a capacitor-switched voltage doubler to double the output voltage for wider frequency range operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional charge pump circuits are used, then the circuit structure remains simple, but the output voltage range is limited
Solution Approach 1:
The patent combines a traditional charge pump circuit with a voltage doubler circuit to create an integrated DC voltage generating device. The charge pump generates a base DC voltage, and the voltage doubler doubles this voltage to achieve an extended output voltage range without requiring a completely new circuit architecture.
Solution Approach 2:
The patent extends the output voltage range by adding a voltage doubling dimension to the traditional charge pump output. By applying the voltage doubler stage, the system achieves twice the voltage range of the original charge pump, effectively adding a multiplicative dimension to the voltage generation capability.
2Adaptability or versatility
If the output voltage range of charge pump is increased, then the VCO output frequency range can be widened, but traditional charge pump circuits cannot provide sufficient voltage range
Solution Approach 1:
The patent merges the charge pump circuit with a voltage doubler circuit to achieve extended voltage range. This combination allows the system to provide a wider DC voltage range that directly translates to wider VCO output frequency range without requiring a complete redesign of the charge pump itself.
Solution Approach 2:
The voltage doubler circuit acts as an intermediary between the charge pump and the VCO. It takes the limited voltage output from the charge pump and transforms it into an extended voltage range suitable for wide-frequency operation of the VCO, thereby mediating the capability gap.
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
Enables PLL and DLL systems to produce a wider range of output frequencies by providing a doubled DC control voltage, overcoming the limitations of traditional charge pump circuits.
Implementation Method 1
utilization of a capacitor-switched voltage doubler for doubling the output voltage of a charge pump
Data Source
AI summary
A differential signal driven direct-current voltage generating device is proposed, which is designed for use with a PLL (phase-locked loop) circuit or a DLL (delay-locked loop) circuit system for generating an output of a direct-current (DC) voltage in response to a pair of differential signals, such as phase-difference signals; and which is characterized by the utilization of a capacitor-switched voltage doubler for doubling the output voltage of a charge pump so that the doubled voltage can be used as a control voltage for a PLL-VCO (voltage-controlled oscillation) or a DLL-VCDL (voltage-controlled delay line) circuit for generation of an output oscillating signal with a wider frequency range.