Ka frequency band frequency conversion integrated circuit

Abstract

The utility model relates to the technical field of integrated circuits, and discloses a Ka-band frequency conversion integrated circuit, which aims to solve the technical problem that the accuracy and the stability of the conventional product during frequency conversion processing of high-frequency signals are insufficient, and is provided with a crystal oscillation reference circuit. A radio frequency (RF) synthesizer used for synthesizing the reference frequency into the RF signal with the preset frequency and an intermediate frequency (IF) synthesizer used for synthesizing the reference frequency into the intermediate frequency signal with the preset frequency are arranged, the RF synthesizer is connected with the first frequency mixer, and the RF synthesizer is connected with the second frequency mixer; the RF synthesizer comprises a first amplifier, the post-stage of the first amplifier is connected with a prescaler, the post-stage of the prescaler is connected with a first counter and a second counter, the post-stage of the first counter is connected with a second amplifier, and the second amplifier is connected with a first mixer. The signal processing performance and precision are improved, and the peripheral design of the system is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of integrated circuits, in particular to a Ka-band frequency conversion integrated circuit. Background Art

[0002] With the advancement of electronic technology, the high-frequency head device used in modern set-top boxes has evolved into a digital signal receiver, which is responsible for receiving and demodulating high-frequency signals and converting them into video information. The digital signal receiver plays the role of the first part of the public channel, which consists of a tuner and a high-frequency signal amplifier. Through digital technology, it can process signals more efficiently and provide clearer and more stable video output.

[0003] There are some problems in the existing technology of Ka-band frequency conversion integrated circuits, mainly focusing on the accuracy and stability of signal processing. Traditional integrated circuits have problems such as low frequency synthesis accuracy and unstable signal quality in the processing of high-frequency signals. These problems may lead to increased errors in the signal processing process, affecting the performance and stability of the entire system, especially in scenarios that require high-precision signal processing, such as wireless communication systems. Therefore, a new Ka-band frequency conversion integrated circuit that can improve the accuracy and stability of signal processing is needed to solve these problems. Utility Model Content

[0004] The utility model aims to provide a Ka-band frequency conversion integrated circuit to solve the technical problem of insufficient accuracy and stability of existing products in frequency conversion processing of high-frequency signals.

[0005] To achieve the above purpose, the specific technical solution of a Ka-band frequency conversion integrated circuit of the utility model is as follows:

[0006] A Ka-band frequency conversion integrated circuit comprises a low noise amplifier, a first mixer, a channel filtering circuit, a second mixer, and an intermediate frequency filter are sequentially arranged at the rear stage of the low noise amplifier, a crystal oscillation reference circuit for generating a reference frequency is arranged, the crystal oscillation reference circuit outputs a radio frequency signal of a predetermined frequency and an intermediate frequency signal of a predetermined frequency to the inside of the integrated circuit respectively, an RF synthesizer for synthesizing the reference frequency into a radio frequency signal of a predetermined frequency, and an IF synthesizer for synthesizing the reference frequency into an intermediate frequency signal of a predetermined frequency, the RF synthesizer is connected to the first mixer, and the RF synthesizer is connected to the second mixer; the RF synthesizer comprises a first amplifier, a rear stage of the first amplifier is connected to a pre-divider, a rear stage of the pre-divider is connected to a first counter and a second counter, a rear stage of the first counter is connected to a second amplifier, and the second amplifier is connected to the first mixer.

[0007] Furthermore, an intermediate frequency amplifier is provided between the second mixer and the intermediate frequency filter. The signal output by the second mixer can be effectively amplified to ensure that the signal strength is sufficient for subsequent processing and transmission. By amplifying the signal, the ratio between the signal and the noise can be improved, the signal quality can be improved, and the output signal can be made clearer and more stable. At the same time, signal amplification also improves the sensitivity of the system, making it easier to detect low-amplitude signals and improving the detection capability of the system. By selecting signals within a specific frequency range for amplification through the amplifier, the system's processing capability for specific signals is enhanced, the performance and stability of the system are improved, and the quality and reliability of the output signal are ensured.

[0008] Furthermore, the low noise amplifier is connected to the antenna, and a high frequency amplifier is provided for looping out the input signal, and the input end of the high frequency amplifier is connected to the input end of the low noise amplifier. Through the amplification of the low noise amplifier, the weak signal received from the antenna can be amplified to an appropriate level for subsequent processing. By amplifying the RF signal inside the integrated circuit and then outputting it to the outside of the integrated circuit, it can be used for monitoring or further processing.

[0009] The Ka-band frequency conversion integrated circuit provided by the utility model has the following advantages:

[0010] The processing capability of high-frequency signals can be effectively improved, ensuring low noise and high signal quality during signal amplification and mixing. The use of RF synthesizers and IF synthesizers to synthesize radio frequency signals and intermediate frequency signals of predetermined frequencies respectively can improve the accuracy and stability of frequency synthesis and adapt to the high-frequency requirements of the Ka band. The dual mixer design (first mixer and second mixer) can realize complex frequency conversion, enhance the frequency selectivity and flexibility of the system, and help optimize the bandwidth and spectrum characteristics of the signal. The channel filter circuit and the intermediate frequency filter can effectively filter out-of-band noise and interference, further improve the signal purity, and ensure the quality and reliability of the output signal. The reference frequency is provided by the crystal oscillator reference circuit to ensure the stability and accuracy of the frequency reference, thereby improving the performance and reliability of the entire integrated circuit. By integrating a low-noise amplifier, a mixer, a filter circuit and a frequency synthesizer, the circuit design outside the integrated circuit is simplified, the need for external components is reduced, and the volume and cost of the system are reduced. The pre-divider, the first counter and the second counter included in the IF synthesizer, in conjunction with the first amplifier and the second amplifier, can realize high-precision frequency division and signal amplification, ensuring that the frequency conversion during the mixing process is accurate. This integrated circuit is suitable for various high-frequency application scenarios, especially in wireless communication systems that require high-frequency frequency conversion and signal processing, and has broad application prospects.

[0011] In summary, the Ka-band frequency conversion integrated circuit not only improves the performance and accuracy of signal processing through optimized design and high integration, but also simplifies the system design, with significant beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the internal functional block diagram of the Ka-band frequency conversion integrated circuit provided by the utility model;

[0013] Figure 2 The circuit structure diagram of the RF synthesizer provided by the utility model;

[0014] Figure 3 This is a structural diagram of the channel filtering circuit provided by the utility model. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0016] See also Figure 1 The utility model provides a Ka-band frequency conversion integrated circuit, including a low noise amplifier, a first mixer, a channel filter circuit, a second mixer, and an intermediate frequency filter are sequentially arranged at the rear stage of the low noise amplifier, and a crystal oscillation reference circuit for generating a reference frequency is arranged, the crystal oscillation reference circuit is connected to a crystal Y1, the crystal oscillation reference circuit outputs a radio frequency signal of a predetermined frequency and an intermediate frequency signal of a predetermined frequency to the inside of the integrated circuit respectively, and outputs a clock signal to the outside of the integrated circuit, which can be used by external devices, and provides a stable frequency reference through the crystal oscillation reference circuit for accurate frequency generation of a synthesizer.

[0017] An RF synthesizer for synthesizing a reference frequency into a radio frequency signal of a predetermined frequency, and an IF synthesizer for synthesizing a reference frequency into an intermediate frequency signal of a predetermined frequency are provided. The RF synthesizer is connected to the first mixer, and the IF synthesizer is connected to the second mixer. The RF synthesizer generates a local oscillation signal required by the mixer to achieve frequency conversion, and the IF synthesizer module generates an intermediate frequency signal used by the mixer to achieve frequency conversion.

[0018] There is a synthesizer calibration setting to ensure the synthesizer is accurately calibrated for precise frequency generation.

[0019] The low noise amplifier is connected to the antenna and is used to amplify the weak input radio frequency (RF) signal received from the antenna with minimal noise.

[0020] The first mixer receives the output signal of the low noise amplifier and the radio frequency signal of a predetermined frequency output from the RF synthesizer, performs mixing, and down-converts the radio frequency signal.

[0021] The channel filter circuit filters the down-converted signal, removes unnecessary frequencies and noise, and performs bandpass filtering to obtain a signal with a relatively low frequency.

[0022] The second mixer receives the signal output from the low channel filter circuit and the intermediate frequency signal of a predetermined frequency output from the IF synthesizer, performs mixing, and down-converts the radio frequency signal into an intermediate frequency (IF) signal.

[0023] An intermediate frequency amplifier LFT and an intermediate frequency filter are sequentially arranged at the rear stage of the second mixer to filter and select signals of a specific frequency so as to remove unnecessary noise and interference signals, and output the filtered and amplified intermediate frequency signal to ensure the purity and quality of the output signal.

[0024] The intermediate frequency filter is located between the gain control module and the IF output. After the signal is amplified and the gain is controlled, it is further processed by the filter and finally output as an intermediate frequency (IF) signal.

[0025] IF OUT output, where the filtered and amplified intermediate frequency signal is output.

[0026] A gain control circuit is provided to adjust the amplification level to maintain the consistency of the output signal amplitude. The gain control circuit inputs an automatic gain control voltage (Vagc) to control the gain adjustment in the gain control module to maintain the consistency of the signal.

[0027] The integrated circuit is provided with an I 2 C interface, allowing communication with an external microcontroller or processor to control and configure the chip.

[0028] A loop-through output circuit is also provided, including a high-frequency amplifier, the input end of the high-frequency amplifier is connected to the input end of the low-noise amplifier, and the radio frequency signal is amplified inside the integrated circuit and then output to the outside of the integrated circuit for monitoring or further processing.

[0029] See also Figure 2 Specifically, the RF synthesizer includes a first amplifier, a prescaler is connected to the post stage of the first amplifier, a first counter and a second counter are connected to the post stage of the prescaler, a second amplifier is connected to the post stage of the first counter, and the second amplifier is connected to the first mixer. The same is true for the IF synthesizer.

[0030] RF synthesizer is a key component for generating radio frequency signals of predetermined frequencies. Its structure and working principle are crucial to the performance of the entire circuit.

[0031] First amplifier: amplifies the input signal for subsequent processing.

[0032] Prescaler: Pre-divides the amplified signal to reduce the frequency to a suitable counting range.

[0033] First counter: counts the pre-divided signal to determine the required frequency.

[0034] Second counter: counts the frequency output by the first counter twice to further accurately control the frequency.

[0035] Second amplifier: amplifies the signal output by the counter so as to output the signal to the first mixer.

[0036] The circuit structure of the RF synthesizer can achieve accurate synthesis and control of the RF signal frequency, thereby ensuring the performance and stability of the entire system when sending and processing signals. Through appropriate design and configuration, the RF synthesizer can achieve rapid switching and adjustment of different RF signal frequencies to adapt to different working requirements and environmental conditions.

[0037] Similarly, the circuit structure of the RF synthesizer can achieve accurate synthesis and control of the intermediate frequency signal frequency, thereby ensuring the performance and stability of the entire system when receiving and processing signals.

[0038] The above components work together to receive, amplify, down-convert, filter and output RF signals, making it an accurate and stable high-frequency wireless receiving chip.

[0039] See also Figure 3 The channel filter circuit includes an operational amplifier U12-A and an operational amplifier U14-A. The signal after the first mixing is input to the in-phase input terminal of the operational amplifier U12-A through resistors R24 and R23 in sequence. The output terminal of the operational amplifier U12-A is connected to the in-phase input terminal of the operational amplifier U14-A through coupling capacitors C4 and C3 in sequence. The output terminal of the operational amplifier U14-A outputs a signal OUT1 to the second mixer.

[0040] The inverting input terminal of the operational amplifier U12-A is grounded through a resistor R21, and a resistor R25 is connected between the output terminal and the inverting input terminal of the operational amplifier U12-A. The output terminal of the operational amplifier U12-A is grounded through a capacitor C5 and a resistor R22 in sequence, and the intermediate node of the capacitor C5 and the resistor R22 is connected to the intermediate node of the resistor R24 ​​and the resistor R23.

[0041] The output end of the operational amplifier U14 is connected to the middle node of the capacitor C4 and the capacitor C3 through the resistor R18, the non-inverting input end of the operational amplifier U14 is grounded, the output end of the operational amplifier U14 is grounded through the resistor R19 and the resistor R20 in turn, and the middle node of the resistor R19 and the resistor R20 is connected to the inverting input end of the operational amplifier U14-A.

[0042] The above circuit is a fourth-order bandpass filter composed of a second-order low-pass filter and a second-order high-pass filter. The filter composed of this circuit can be used to select a signal within a specific frequency range from the signal to obtain a first intermediate frequency signal, which has a lower frequency than the signal output by the first mixer, and filters out signals of other frequencies, thereby realizing functions such as frequency modulation and denoising of the signal.

[0043] The implementation of the utility model provides a Ka-band frequency conversion integrated circuit, which brings the following beneficial effects:

[0044] Through low-noise amplifiers and appropriate filters, high-performance amplification and processing of weak RF signals received from the antenna are achieved, ensuring signal quality. Using RF and IF synthesizers, the stable frequency reference provided by the crystal oscillator reference circuit is used to achieve accurate synthesis of the predetermined frequency RF signal and the intermediate frequency signal, ensuring signal stability and accuracy. The design of the RF and IF synthesizers enables the system to quickly switch and adjust different RF signal frequencies to adapt to different working requirements and environmental conditions. Through the collaboration of modules such as channel filtering circuits, intermediate frequency amplifiers and intermediate frequency filters, the signals are filtered, amplified and selected to ensure the purity and quality of the output signal. Integrated I 2 C interface and gain control circuit, allowing communication with an external microcontroller or processor to achieve flexible control and configuration of the chip.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A Ka-band frequency conversion integrated circuit, comprising a low noise amplifier, a first mixer, a channel filter circuit, a second mixer, an intermediate frequency filter are sequentially arranged at the rear stage of the low noise amplifier, and a crystal oscillator reference circuit for generating a reference frequency is arranged, and the crystal oscillator reference circuit outputs a radio frequency signal of a predetermined frequency and an intermediate frequency signal of a predetermined frequency to the inside of the integrated circuit respectively, characterized in that: An RF synthesizer for synthesizing a reference frequency into a radio frequency signal of a predetermined frequency, and an IF synthesizer for synthesizing a reference frequency into an intermediate frequency signal of a predetermined frequency, are provided. The RF synthesizer is connected to a first mixer, and the RF synthesizer is connected to a second mixer. The RF synthesizer comprises a first amplifier, a post stage of the first amplifier is connected to a pre-divider, a post stage of the pre-divider is connected to a first counter and a second counter, a post stage of the first counter is connected to a second amplifier, and the second amplifier is connected to the first mixer.

2. The Ka-band frequency conversion integrated circuit according to claim 1, characterized in that: An intermediate frequency amplifier is also arranged between the second mixer and the intermediate frequency filter.

3. The Ka-band frequency conversion integrated circuit according to claim 2, characterized in that: The low noise amplifier is connected to the antenna, and is provided with a high frequency amplifier for looping out the input signal, and the input end of the high frequency amplifier is connected to the input end of the low noise amplifier.

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