CN201518473U - Tunnel diode detector cut-off frequency expanded circuit - Google Patents

Abstract

The utility model discloses a tunnel diode detector cut-off frequency expanded circuit, which is characterized by comprising a matching circuit, an inductor, a capacitor, a low-pass filter and two tunnel diodes, wherein one end of the matching circuit is connected with a microwave signal input end, and the other end thereof is connected in parallel with a detection circuit, two tunnel diodes and the capacitor in the detection circuit are connected in series, and then are connected in parallel with the inductor, the capacitor is connected in parallel with a detected element which is connected in series with the low-pass filter, the cut-off frequency of a tunnel diode detector is that L is a gross lead inductance of the tunnel diode in the formula, and Cj is the junction capacitance of the tunnel diodes. The tunnel diode detector cut-off frequency expanded circuit can expand a detector in microwave frequency band into millimeter-wave frequency band for satisfying the power detection of millimeter-wave communication, and has the advantages of simple circuits, safety, reliability and the like.

Description

Tunnel diode wave detector cut-off frequency expanded circuit

Technical field

The utility model relates to communication technique field, is specifically related to a kind of circuit of expanding tunnel diode wave detector cut-off frequency.

Background technology

Wave detector (power detector) is the important devices of extensive use in the wireless telecommunications system, be widely used in RSSI, transmitting power control, occasions such as high-speed data I/O and cellular basestation, be to measure the nonlinear characteristic that the requisite device wave detector of electronic environment amplitude information utilizes some semiconductor device, be used for detection of modulation signal envelope or microwave power detection, typical circuit as shown in Figure 1.

The cut-off frequency that influences wave detector mainly is the junction capacitance C of tunnel diode _jWith lead-in inductance L, promptly

$F_t=\frac{1}{\sqrt[2]{L{C}_j}}.$

It is short that one big advantage of existing diode detector is exactly recovery time, is used for burst pulse in a large number and detects, and its cut-off frequency generally all can only reach 30GHz, when processing is higher than power detection difficulty relatively just in the millimeter wave communication of 30GHz.For addressing the above problem, the utility model provides a kind of new solution.

The utility model content

Technical problem to be solved in the utility model is: how a kind of tunnel diode wave detector cut-off frequency expanded circuit is provided, this tunnel diode wave detector cut-off frequency expanded circuit can expand to millimeter wave frequency band from microwave frequency band with the cut-off frequency of tunnel diode wave detector, thereby satisfies the communication power detection to millimeter wave frequency band.

For achieving the above object, the technical scheme that the utility model adopted is: a kind of tunnel diode wave detector cut-off frequency expanded circuit is provided, it is characterized in that: comprise match circuit, inductor, capacitor, low pass filter and 2 tunnel diodes; Described match circuit one end is connected with the microwave signal input, and the other end and detecting circuit are in parallel; Be in parallel with inductor again after 2 tunnel diodes and capacitor are connected successively in the described detecting circuit; Described capacitor is in parallel with the tested element that is connected with low pass filter; The cut-off frequency of described tunnel diode wave detector is:

$F_t=\frac{\sqrt{2}}{\sqrt[2]{L{C}_j}}$

In the formula, L is total lead-in inductance of tunnel diode, C _jJunction capacitance for tunnel diode.

In sum, tunnel diode wave detector cut-off frequency expanded circuit provided by the utility model can expand to millimeter wave frequency band from microwave frequency band with the cut-off frequency of tunnel diode wave detector, thereby satisfies the communication power detection to millimeter wave frequency band; Also have advantages such as circuit is simple, safe and reliable simultaneously.

Accompanying drawing and explanation thereof

Fig. 1 is the circuit diagram of traditional diode detector;

Fig. 2 is tunnel diode wave detector cut-off frequency expanded circuit figure.

Embodiment

Below in conjunction with accompanying drawing the utility model is further described:

As shown in Figure 2, this tunnel diode wave detector cut-off frequency expanded circuit comprises match circuit, inductor, capacitor, low pass filter and 2 tunnel diodes; Described match circuit one end is connected with the microwave signal input, and the other end and detecting circuit are in parallel; Be in parallel with inductor again after 2 tunnel diodes and capacitor are connected successively in the described detecting circuit; Described capacitor is in parallel with the tested element that is connected with low pass filter; The cut-off frequency of described tunnel diode wave detector is:

$F_t=\frac{\sqrt{2}}{\sqrt[2]{{\mathrm{LC}}_j}}$

In the formula, L is total lead-in inductance of tunnel diode, C _jJunction capacitance for tunnel diode.

The cut-off frequency of tunnel diode wave detector provided by the utility model is:

$F_t=\frac{1}{\sqrt[2]{\mathrm{LC}}}$

In the formula, L is total lead-in inductance of tunnel diode, and C is total junction capacitance of tunnel diode:

$C=\frac{1}{\frac{1}{C_j}+\frac{1}{C_j}}=\frac{1}{2}{C}_j$

Wherein, C _jJunction capacitance for tunnel diode.

In sum, the cut-off frequency of tunnel diode wave detector provided by the utility model is just:

Wherein, L is total lead-in inductance of tunnel diode, C _jJunction capacitance for tunnel diode.By above-mentioned analysis as can be known, the cut-off frequency of this tunnel diode wave detector has been expanded

Doubly, thereby the wave detector of microwave frequency band is expanded to millimeter wave frequency band, satisfy the power detection of millimeter wave communication.Also have advantages such as circuit is simple, safe and reliable simultaneously.

But; the above only is a preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection range of the utility model claim.

Claims (1)

1. a tunnel diode wave detector cut-off frequency expanded circuit is characterized in that: comprise match circuit, inductor, capacitor, low pass filter and 2 tunnel diodes; Described match circuit one end is connected with the microwave signal input, and the other end and detecting circuit are in parallel; Be in parallel with inductor again after 2 tunnel diodes and capacitor are connected successively in the described detecting circuit; Described capacitor is in parallel with the tested element that is connected with low pass filter; The cut-off frequency of described tunnel diode wave detector is:

$F_t=\frac{\sqrt{2}}{\sqrt[2]{{\mathrm{LC}}_j}}$

In the formula, L is total lead-in inductance of tunnel diode, C _jJunction capacitance for tunnel diode.

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