Split Voltage Domain Receiver Circuits for Photodiode Signal Amplification
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Solution Overview
Problem
Electronic circuits face challenges in operating efficiently across a wide range of voltage due to variable battery outputs, noise in bias voltages, and performance degradation from high voltages, especially in integrated transmitter/receiver devices where different circuits require different voltage levels for optimal operation.
Innovation Solution
The implementation of split voltage domain receiver circuits, where complementary signals are amplified in multiple partial voltage domains, combined into a single differential signal, and controlled via feedback loops, allowing for reduced voltage swing and improved power efficiency by integrating photodetectors within the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a higher bias voltage is used to avoid saturation in amplifier applications, then the amplifier performance is improved, but power consumption increases and leakage current becomes excessive
Solution Approach 1:
The voltage domain is segmented into multiple partial voltage domains, each handling a portion of the signal amplification. This allows the circuit to achieve the necessary total gain without requiring a single high-voltage stage, thereby reducing peak power consumption and leakage current while maintaining amplifier performance.
Solution Approach 2:
The invention transitions from a single voltage domain to multiple stacked voltage domains, adding a vertical dimension to the signal processing architecture. Signals are processed across multiple voltage levels (Vdd/2, Vdd) in sequence, enabling high gain accumulation without proportionally increasing power consumption at any single stage.
2Device complexity
If a single voltage domain is used for signal processing, then the circuit design is simplified, but the signal-to-noise ratio deteriorates due to large voltage swing
Solution Approach 1:
The signal processing is segmented across multiple voltage domains, with each domain contributing a portion of the total gain. This segmentation reduces the voltage swing required in each individual stage, thereby improving the signal-to-noise ratio while maintaining manageable circuit complexity through systematic design.
Solution Approach 2:
Feedback loops are implemented to control and stabilize the signals as they pass through multiple voltage domains. This feedback mechanism ensures proper signal levels are maintained at each stage, optimizing the signal-to-noise ratio while preventing circuit instability that would increase design complexity.
3Reliability
If different voltage levels are used for transmitter and receiver circuits, then each circuit operates at optimal voltage, but integration becomes complex
Solution Approach 1:
The invention uses stacked voltage domains to provide multiple voltage levels within a single integrated circuit. By stacking voltage domains vertically (with different DC offsets), the circuit can simultaneously support transmitter circuits operating at higher voltages and receiver circuits operating at lower voltages, enabling optimal operation for both while maintaining a unified integrated structure.
Data Source
AI summary
Methods and systems for split voltage domain receiver circuits are disclosed and may include amplifying complementary received signals in a plurality of partial voltage domains. The signals may be combined into a single differential signal in a single voltage domain. Each of the partial voltage domains may be offset by a DC voltage from the other partial voltage domains. The sum of the partial domains may be equal to a supply voltage of the integrated circuit. The complementary signals may be received from a photodiode. The amplified received signals may be amplified via stacked common source amplifiers, common emitter amplifiers, or stacked inverters. The amplified received signals may be DC coupled prior to combining. The complementary received signals may be amplified and combined via cascode amplifiers. The voltage domains may be stacked, and may be controlled via feedback loops. The photodetector may be integrated in the integrated circuit.