Multi-band Receiver LO Signal Generator Cross-talk Mitigation
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Solution Overview
Problem
Conventional multi-band communication devices experience signal degradation due to cross-talk between receiver subunits, particularly when oscillators are tuned closely to each other or when harmonic frequencies overlap, leading to inaccurate down conversion and demodulation.
Innovation Solution
Incorporating frequency dividers with divisors other than two, such as odd integers, to separate the oscillation frequencies of receiver subunits and using phase error compensation to manage phase shifts, thereby reducing cross-talk interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate first and second LO signal generators are used to provide LO signals to first and second I/O receiver subunits for concurrent reception, then the device can concurrently receive data over multiple channels, but cross-talk between receiver subunits degrades reception quality
Solution Approach 1:
The patent merges the LO signal generation functionality into a single shared LO signal generator that provides LO signals to multiple receiver subunits. This consolidation eliminates cross-talk between separate oscillators while maintaining concurrent reception capability across multiple channels, directly resolving the contradiction between productivity and reliability.
2Adaptability or versatility
If oscillators are tuned closely to each other to receive adjacent channels, then the device can receive data on adjacent 2G channels, but cross-talk between oscillators makes accurate down conversion difficult
Solution Approach 1:
The patent introduces a single shared LO signal generator as an intermediary that serves multiple receiver subunits. This mediator provides precisely controlled LO signals at the required frequencies for adjacent channel reception without the cross-talk that would occur between independently tuned oscillators, thereby maintaining both adaptability and measurement precision.
3Adaptability or versatility
If a harmonic frequency from one receiver subunit is close to the wanted RF frequency of another subunit, then the device can operate in multi-band mode, but harmonic frequencies degrade the signal on other receivers
Solution Approach 1:
The patent extracts the harmful harmonic frequencies from the system by using a single shared LO signal generator that can be precisely controlled to avoid generating harmonics that would interfere with other receiver subunits. This extraction of the harmful element (separate oscillators generating interfering harmonics) allows multi-band operation without signal degradation.
Data Source
AI summary
Some embodiments of the present disclosure relate to multiband receivers that include at least one divider unit having a divisor that is other-than-two. For example, in some embodiments the divisor is an odd integer (e.g., three). Such divisors allow oscillators for respective receiver subunits in a multi-band receiver to have frequencies that are sufficiently different from one another so as to limit cross-talk interference there between, even when the receiver subunits are concurrently receiving data on adjacent channels. To facilitate this other-than-two divisor, a phase error compensation block is often used to compensate for the effects of using the other-than-two divisor.