Shared Local Oscillator Path for Balanced I/Q Signal Reception
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Solution Overview
Problem
Existing signal receiving devices face imbalances in in-phase and quadrature signals due to differences in path and loss between local oscillator signal paths, leading to interference with received signals.
Innovation Solution
A signal receiving device that supplies local oscillation signals through a single signal path using a time division method, employing a local oscillation signal supplying system with a polarity switching unit and phase judging system to ensure balanced frequency conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate local oscillator signal paths are used for in-phase and quadrature signals, then signal demodulation can be performed, but signal imbalances and interference occur due to path differences and loss variations
Solution Approach 1:
The patent merges the separate local oscillator signal paths for in-phase and quadrature signals into a single shared path. The local oscillator signal is generated once and then distributed to both the in-phase mixer and quadrature mixer through a single path, eliminating path differences and loss variations between the two channels, thereby resolving signal balance issues while maintaining demodulation accuracy
2Reliability
If multiple components (buffers, filters, A/D converters) are provided for both in-phase and quadrature signals, then complete signal processing is achieved, but device complexity and circuit area increase
Solution Approach 1:
The patent applies merging principles to share common components between in-phase and quadrature signal paths. Specifically, a single local oscillator buffer, common filtering stages, and shared A/D converters are used by both signal channels, reducing the total number of components required while maintaining complete signal processing capability for both in-phase and quadrature channels
Solution Approach 2:
The patent implements universal components that serve multiple functions. For example, a single buffer amplifier serves both in-phase and quadrature local oscillator signals, and common filtering and conversion stages process both signal channels, allowing each component to perform multiple functions and thereby reducing overall device complexity and circuit area
3Reliability
If separate signal paths with multiple components are used, then signal processing capability is maintained, but power consumption increases
Solution Approach 1:
The patent reduces power consumption by merging separate signal paths into a shared architecture. Components such as the local oscillator buffer, filters, and A/D converters are shared between in-phase and quadrature channels, eliminating redundant power consumption from duplicate components while maintaining full signal processing capability for both channels
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
This approach resolves signal imbalances and reduces power consumption by eliminating the need for separate paths and components like phase on/off switches and filters, thereby improving signal demodulation and reducing circuit area.
Implementation Method 1
a converting unit to convert a frequency of the receiving signal to be inputted from the inputting unit based on a local oscillation signal to be outputted from the local oscillation signal outputting unit
Data Source
AI summary
A signal receiving device is provided which can prevent the imbalance occurring between in-phase and quadrature signals. A polarity of a local oscillator output signal to be outputted from a local oscillator 13 is switched by a polarity switching unit 14 in a time division way. Each of signals outputted from the polarity switching unit 14 is frequency divided by a frequency divider 16. The frequency-divided local oscillation signal is supplied to a mixer 34. Frequency conversion of a receiving signal is performed by the mixer 34 which receives the signal and local oscillation signal to demodulate received data.