Variable gain mixed-frequency amplifier and biological signal acquisition and processing chip and system
A bio-signal, processing chip technology, applied in sensors, medical science, diagnostic recording/measurement, etc., can solve problems such as the expansion of circuit functions, the inability to change the internal circuit of the chip, and the large area of the circuit structure.
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Embodiment 1
[0042] See figure 1 , figure 1 It is a schematic diagram of a circuit structure of a biological signal acquisition and processing system provided by an embodiment of the present invention. The biological signal acquisition and processing system 1 may include a biological signal acquisition and processing chip 10 , an earphone interface 20 , a biological electrode 30 and a terminal 40 . Wherein, the biological signal collection and processing chip 10 is electrically connected to the biological electrode 30 and sends the collected and modulated biological signal to the terminal 40 through the earphone interface 20 . The system 1 can collect and process different types of biological signals (such as electrocardiographic signals, electroencephalographic signals, electromyographic signals, etc.).
[0043] Specifically, the bio-electrodes 30 are attached to the parts of the organism (such as the human body) to be collected to collect bio-signals, and the collected bio-signals are ...
Embodiment 2
[0050] Please also see Figure 3 to Figure 6 , image 3 A schematic diagram of a circuit structure of a variable gain mixing amplifier provided by an embodiment of the present invention; Figure 4 A schematic diagram of a circuit structure of a low-noise pre-mixing amplifier provided by an embodiment of the present invention; Figure 5 A comparative schematic diagram of a circuit structure of a variable gain mixing amplifier provided by an embodiment of the present invention; Figure 6 A schematic circuit diagram of an AM modulation module provided by an embodiment of the present invention. In this embodiment, on the basis of the above embodiments, the circuit of the variable gain mixing amplifier is described in detail.
[0051] See image 3 , the variable gain mixing amplifier 11 may include a low-noise pre-mixing amplifier 111, a programmable gain amplifier 112, a band-pass filter 113 and an output buffer 114; wherein the low-noise pre-mixing amplifier 111 , the progra...
Embodiment 3
[0060] See Figure 7 and Figure 8 , Figure 7 A schematic circuit structure diagram of a local oscillator signal generating circuit provided by an embodiment of the present invention; Figure 8 It is a schematic circuit diagram of a signal shaping circuit provided by an embodiment of the present invention. In this embodiment, the local oscillator signal generation circuit is described in detail on the basis of the foregoing embodiments.
[0061] See Figure 7 , the local oscillator signal generating circuit 12 may include a bias circuit 121 and a signal shaping circuit 122, and the bias circuit 121 and the signal shaping circuit 122 are sequentially connected to the local oscillator of the variable gain mixing amplifier 11 The signal input terminal LO, and the input terminal of the bias circuit 121 receives the AC signal. Wherein, the input of the bias circuit 121 is connected to the right channel input signal, the output is connected to the input of the signal shaping c...
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