Integrated Frequency Converter Using Rectangular Pulse Mixing for Linearity
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Solution Overview
Problem
Conventional frequency converters exhibit poor linearity performance, resulting in limited dynamic range and increased intermodulation distortion and spurious responses, which are inadequate for modern communication systems requiring high dynamic range operation.
Innovation Solution
A frequency conversion circuit and method utilizing a pulse generator and mixer integrated on a single microwave integrated circuit, generating a balanced rectangular pulse signal pair from a local oscillator signal pair to achieve high-linearity performance over a wide range of frequencies, with the pulse generator using a nonlinear transmission line and reflector to reduce rise and fall times and improve edge steepness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional frequency converters (e.g., star mixer) are used, then device complexity is reduced, but linearity performance deteriorates resulting in poor dynamic range and high intermodulation distortion
Solution Approach 1:
The patent combines the pulse generator and mixer into a single integrated circuit, merging two previously separate functions into one device. This integration maintains the high linearity performance of the pulse generator while reducing overall device complexity and improving reliability through unified design and manufacturing.
Solution Approach 2:
The patent employs a pulse generator that dynamically switches between different signal states to create rectangular pulses with controlled rise and fall times. This dynamic operation enables the system to achieve superior linearity performance by optimizing the pulse waveform characteristics for frequency conversion applications.
2Ease of manufacture
If conventional frequency converters are used, then ease of manufacture is improved, but intermodulation distortion increases reducing dynamic range
Solution Approach 1:
By integrating the pulse generator and mixer on a single chip, the patent eliminates the need for separate discrete components and their associated interconnections, thereby reducing intermodulation distortion while maintaining ease of manufacture through standard integrated circuit fabrication processes.
Solution Approach 2:
The patent changes the operational parameters of the frequency converter by using rectangular pulse signals with specific rise and fall times instead of conventional continuous wave signals. This parameter change reduces intermodulation distortion and improves dynamic range while remaining compatible with standard manufacturing techniques.
3Reliability
If pulse generator with reflector is used, then linearity is improved, but device complexity increases
Solution Approach 1:
The patent merges the pulse generator containing the reflector with the mixer into a single integrated circuit. This integration consolidates the increased complexity of the reflector-based pulse generation into one unified device, making the overall system more manageable while preserving the linearity improvements.
4Ease of operation
If conventional mixers are used, then ease of operation is maintained, but spurious responses increase reducing signal quality
Solution Approach 1:
The patent changes the signal waveform parameters from conventional continuous waves to rectangular pulses with controlled edge rates. This parameter change reduces spurious responses while maintaining ease of operation, as the integrated circuit handles the complex pulse generation automatically without requiring additional user intervention.
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
The solution provides enhanced linearity and reduced distortion, enabling frequency conversion over a broader range with lower intermodulation distortion and spurious responses, thus meeting the high dynamic range requirements of modern communication systems.
Implementation Method 1
a reflector configured to delay and reflect the balanced rectangular wave signal pair
Data Source
AI summary
A frequency converter (100) is provided, comprising: a pulse generator (150) configured to receive a balanced local oscillator signal pair and to generate a balanced rectangular pulse signal pair having the reference frequency; and a mixer (160) configured to mix an input signal having an input frequency with the balanced rectangular pulse signal pair to generate an output signal having an output frequency. The input frequency is different from the output frequency, and the pulse generator and the mixer are formed on a single integrated circuit (120). The frequency converter may comprise a balanced local oscillator (110) configured to generate the balanced local oscillator signal pair. The balanced local oscillator may comprise: an unbalanced local oscillator (130) configured to provide an unbalanced local oscillator signal having the reference frequency; and a balun (140) configured to generate the balanced local oscillator signal pair based on the unbalanced local oscillator signal.