Integrated PIN Diode Driver for High-Current Fast Switching
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Solution Overview
Problem
Current high voltage PIN diode drivers are not fully integrated and struggle to sink and source high currents efficiently, leading to slow switching speeds and significant printed circuit board area usage, with conventional solutions relying on discrete power MOSFETs and bootstrap capacitors that fail to maintain the off-state of PIN diodes due to capacitor discharge.
Innovation Solution
A fully integrated ASIC PIN diode driver that translates input signals across voltage domains, amplifies signals to drive diodes, and provides high current capability without external power MOSFETs, featuring a voltage translator for compatibility with regular logic and temperature compensation, enabling fast switching speeds and low quiescent power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If discrete power MOSFETs and bootstrap capacitors are used to achieve high current capability, then current sourcing/sinking capability is improved, but device complexity and printed circuit board area increase
Solution Approach 1:
The patent merges the MOSFETs, bootstrap capacitors, gate drivers, and current limiting resistors into a single integrated circuit. This consolidation maintains the high current capability while reducing device complexity and PCB area by eliminating the need for multiple discrete components and their interconnections.
Solution Approach 2:
The integrated circuit performs multiple functions simultaneously: it provides high current sourcing and sinking capability, includes bootstrap capacitor charge pumps, incorporates gate drivers for MOSFET control, and integrates current limiting protection. This multi-functionality replaces what previously required separate discrete components.
2Reliability
If discrete power MOSFETs and large current limiting resistors are used to protect from high transient currents, then reliability is improved, but printed circuit board area and device complexity increase
Solution Approach 1:
The current limiting resistors are integrated within the IC package rather than being discrete external components. This integration maintains the protection function against high transient currents while dramatically reducing the PCB area required, as the resistors occupy minimal space within the integrated circuit structure.
3Productivity
If conventional gate drivers with bootstrap capacitors are used to drive high side MOSFETs, then switching capability is improved, but the PIN diodes cannot remain in off-state due to capacitor discharge
Solution Approach 1:
The integrated circuit incorporates feedback mechanisms that monitor the bootstrap capacitor voltage and refresh it as needed during operation. This feedback control ensures the capacitor maintains sufficient voltage to keep the high side MOSFETs properly turned off, preventing the reliability issue of inadvertent conduction while preserving fast switching capability.
4Device complexity
If fully integrated ASIC is implemented to reduce device complexity and area, then printed circuit board area is reduced, but achieving high current capability becomes more difficult
Solution Approach 1:
The integration combines high current capability transistors, bootstrap capacitor charge pumps, gate drivers, and control logic into a single ASIC. This merging achieves both reduced device complexity and maintained high current capability by designing the transistors with sufficient current ratings and providing dedicated bootstrap circuits for proper MOSFET operation.
Data Source
AI summary
An apparatus having a first circuit, a second circuit and a third circuit is disclosed. The first circuit may be configured to translate an input signal in a first voltage domain to generate a complementary pair of first signals in a second voltage domain. The second circuit may be configured to logically switch the first signals to generate a complementary pair of second signals in the second voltage domain. The first signals may be logically switched such that both of the second signals are inactive before one of the second signals transitions from inactive to active. The third circuit may be configured to amplify the second signals to generate a complementary pair of output signals in the second voltage domain. Each of the output signals generally has a current capacity to drive one or more of a plurality of diodes in a diode switch circuit.