VCXO Reference Clock Compensation for DVB-H Receivers
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Solution Overview
Problem
Current mobile handsets require separate and expensive crystal oscillator circuits for each wireless service, increasing the overall cost and complexity, especially when handling multiple wireless standards like DVB-H, GSM, and WCDMA, as they struggle to maintain accurate reference frequencies during service handovers.
Innovation Solution
A wireless receiver design utilizing a single voltage controlled crystal oscillator (VCXO) to generate a reference frequency, which is shared among multiple receivers, allowing each to adjust and maintain accurate carrier frequencies independently, thereby reducing costs and preventing erroneous compensation across different services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate crystal oscillator circuits are used for each wireless service, then frequency accuracy is maintained, but device cost and complexity increase
Solution Approach 1:
The patent merges multiple separate crystal oscillator circuits into a single shared oscillator that serves multiple wireless receivers. The single oscillator generates a common reference frequency that is distributed to all receivers, eliminating the need for separate oscillators while maintaining frequency accuracy through shared stability characteristics.
Solution Approach 2:
The single crystal oscillator is designed to serve multiple functions by providing reference frequency to different wireless service receivers simultaneously. This universal oscillator replaces what would traditionally require multiple specialized oscillators, reducing overall system complexity while maintaining the precision needed for various wireless standards.
2Device complexity
If a single oscillator circuit is shared among multiple receivers, then device cost and complexity are reduced, but frequency tracking accuracy may deteriorate
Solution Approach 1:
The system segments the frequency compensation function by providing separate compensation mechanisms to each receiver while sharing the common oscillator. Each receiver independently adjusts its local oscillator based on feedback specific to its wireless service requirements, allowing precise frequency tracking despite sharing a common reference source.
Solution Approach 2:
The patent implements feedback loops in each receiver that monitor frequency accuracy and generate compensation signals. These feedback mechanisms allow each receiver to maintain precise frequency tracking by continuously adjusting its operation based on actual performance, compensating for any variations introduced by sharing the single oscillator.
3Stability of the object's composition
If multiple separate oscillator circuits are used, then frequency stability is maintained, but power consumption increases
Solution Approach 1:
The patent combines multiple power-consuming oscillator circuits into a single shared oscillator, directly reducing total power consumption. The single oscillator serves all wireless receivers, eliminating redundant power usage while maintaining frequency stability through the shared stable reference source.
Data Source
AI summary
A wireless receiver providing multiple services (FIG. 3) is disclosed. The wireless receiver includes an oscillator circuit (304, FIG. 4) arranged to produce a reference frequency (308). A first receiver (302) receives a first signal (300) having a first carrier frequency in response to the reference frequency. A second receiver (322) receives a second signal (320) having a second carrier frequency different from the first carrier frequency in response to the reference frequency.