JPS5818152A - Two-series of amplifying circuit for high frequency signal - Google Patents

Abstract

PURPOSE:To simplify a high frequency circuit, by deriving the 3rd reference signal in a frequency of sum or difference between the 1st and 2nd reference signals, and obtaining the 2nd intermediate frequency signal, through the frequency conversion of the 1st intermediate signal. CONSTITUTION:A frequency 16MHz being the sum between an IF reference 11 of 10MHz and an IF reference 12 of 6MHz or being difference in 4MHz is obtained at ah IF mixer 14 to form an IF reference 17. An intermediate frequency signal of 10MHz being the output of an RF mixer 3 is also inputted to an IF mixer 13 and the signal is converted into an intermediate frequency signal of 6MHz by assuming the IF reference 17 as a reference signal, phase detection is made at a phase detector 8 by assuming the IF reference 12 in 6MHz as a reference signal and inputted to a circuit of magnetic field control loop as a control system signal 16. Thus, only one series is required the RF reference for the RF mixer, allowing to simplify a high frequency circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an amplifier circuit for a nuclear magnetic resonance apparatus, particularly having a dual phase discrimination function.

Nuclear magnetic resonance equipment amplifies the entire detected resonance signal.

It consists of a measurement system for displaying on one display after detection, and a control system for stabilizing the measurement magnetic field, which includes a magnetic field control loop between the measurement magnetic field and the measurement magnetic field. In particular, when the resonant nuclide in the measurement system and control system is the same, such as in proton internal lock, it is necessary to branch the resonance signal from the detector to two amplifiers in total, and conventionally the configuration was as shown in Figure 1. become.

The 90 MHZ high frequency signal from Globe 1 is amplified by FLF amplifier 2, branched to RF' mixer 3 and RF mixer 6, and then sent to 100 MHZ RF reference 9. ! =96M
Convert the frequency using H2's RF reference 10,
Obtain 10MH2 and 6MH2 intermediate frequency (IP) signals.

The IF multiplied signal of IOMH2 is amplified by the IF amplifier 4 and then phase detected by the phase detector 5 (IOM) (Z's IFL/reference lli The phase is detected as a reference signal and input to the display as the measurement system signal 15. Also, the IF multiplied signal of 6MH2 is amplified by the IF amplifier After amplification in step 7, the phase detector 8 performs phase detection using the 6MH2 IF reference 12 as a reference signal, and inputs it to the magnetic field control loop circuit as a control system signal 16. In this way, in the conventional circuit,
Two types of 9°10 RF references and two types of 3.6 RF mixers are required, which has the disadvantage of complicating the configuration and adjustment work of the high frequency circuit.

An object of the present invention is to obtain measurement system signals and control system signals using a double-row amplifier circuit in a nuclear magnetic resonance apparatus.
An object of the present invention is to provide a high-frequency signal dual-series amplification circuit that simplifies the high-frequency system and contributes to cost reduction.

The present invention was made for the purpose of reducing the cost of nuclear magnetic resonance equipment.
, Since one element is to simplify the high-frequency circuit, the conventional two-base R and F references are combined into one series, and ■
The second intermediate frequency signal was obtained using the F reference. 'Hereinafter, one embodiment of the present invention will be described as a second embodiment.
This will be explained using figures. After amplifying the 90MH2 high frequency signal from probe 1 with RF amplifier 2, RF mixer 3 outputs 1
1 as a reference signal to the RF reference 9 of 00M1l
Frequency conversion is performed to an intermediate frequency signal of 0MH2.

After being amplified by the IF amplifier 4, the phase detector 5 detects the phase using the 10MH2 IFL' phase 11 as a reference signal, and inputs the signal as a measurement system signal 15 to the display. On the other hand, 10MH2
The sum of the IP reference 11 and the IPV frequency 12 of 6MH2 is the frequency 16Ml1-1 or the difference frequency is 4M.
Obtained with H2t-IP mixer 14 and designated as IF reference 17.

Then, the intermediate frequency signal of the IOMH2 generated by the output of the RF mixer 3 is inputted to the IF mixer 13, and
11L converts the 4MHz ■F reference 17 as a reference signal into a 6MH2 intermediate frequency signal, amplifies it in the ■F amplifier 7, performs phase detection with the phase detector 8 using the 6MH2 IP reference 12 as a reference signal, and then outputs the control system. It is input as signal 16 to the circuit of the magnetic field control loop. As mentioned above, RF
The reference and RF mixer can be used in one series, which means that the high frequency circuit can be simplified.

According to the present invention, since the high frequency circuit can be simplified, the manufacturing cost of the device can be reduced.

[Brief explanation of the drawing]

FIG. 1 shows a configuration diagram of a conventional circuit, and FIG. 2 shows a configuration diagram of an embodiment of the present invention.

Claims (1)

[Claims] 1. Convert the high frequency signal into two series of intermediate frequency signals, and
In an amplifier capable of phase-detecting the intermediate frequency signal of the first reference signal using the first reference signal and the second intermediate frequency signal using the second reference signal to distinguish the phase components in the two basic columns, The frequency of the first intermediate frequency signal is converted using the sum or difference frequency of the signal and the second reference signal as a third reference signal, and the second intermediate frequency signal is converted into a second intermediate frequency signal.
1. A high-frequency signal dual-series amplification circuit configured to obtain an intermediate frequency signal.