CN210225349U - Power amplifying circuit for L wave band - Google Patents

Abstract

The utility model relates to a power amplification circuit for L wave band. The utility model discloses a main objective provides low-cost implementation, the utility model discloses a scheme mainly includes the 2 grades of amplifier circuit that constitute by 2 power amplifier tubes respectively, has set up high pass filter circuit around amplifier circuit, has set up the electric capacity that prevents high frequency interference between amplifier circuit. Compare in traditional structure, the utility model discloses a circuit structure is simple, can satisfy the user demand of generality, provides support for the design of low-cost product.

Description

Power amplifying circuit for L wave band

Technical Field

The utility model relates to a power amplification circuit for L wave band.

Background

With the rapid development of the radio frequency field, the requirements for the radio frequency module are higher and higher at present, and not only miniaturization is required, but also various requirements for signal transmission, such as high linearity, high gain and the like, are also required, and even the universality in a specified frequency range is required. However, as a product with high technical content, there are not many companies that have the capability of improving the power amplifier in terms of architecture, and it is difficult for a general company to make a product meeting various high requirements. Correspondingly, the price of various high-performance products is high, but in practical application, not all products need such high performance, and for most products with universality, lower cost is the primary goal under the condition of application.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve, be exactly to above-mentioned problem, provide a power amplification circuit to L wave band, different with the mainstream purpose be, the utility model discloses satisfying under the prerequisite that general applicability, controlling the cost of whole circuit is favorable to the demand of generalized product.

The utility model adopts the technical proposal that: a power amplifying circuit for an L-band, as shown in fig. 1, includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a first power amplifier tube, and a second power amplifier tube; one end of the first inductor L1 is connected with an input signal, the other end of the first inductor L1 is connected with one end of a first capacitor C1 through a first resistor R1, the other end of the first capacitor C1 is connected with the grid of a first power amplifier tube, and the connection point of the first capacitor C1 and the grid of the first power amplifier tube is grounded through a second resistor R2; the grid of the first power amplifier tube is connected with one end of a second inductor L2, the other end of the second inductor L2 is connected with a power supply, and the other end of the first inductor L2 is grounded through a second capacitor C2; the source electrode of the first power amplifier tube is grounded through a third resistor R3 and a fifth capacitor C5 which are connected in parallel; the drain of the first power amplifier tube is connected with one end of a third inductor L3, the other end of the third inductor L3 is connected with a power supply, and the other end of the third inductor L3 is grounded through a third capacitor C3; the drain electrode of the first power amplification tube is connected with the grid electrode of the second power amplification tube through a fourth capacitor C4, and the connection point of the fourth capacitor C4 and the grid electrode of the second power amplification tube is grounded through a fourth resistor R4; the source electrode of the second power amplifier tube is grounded through a fifth resistor R5 and a sixth capacitor C6 which are connected in parallel; the drain of the second power amplifier tube is connected to one end of the third inductor L3 and one end of the seventh capacitor C7, and the other end of the seventh capacitor C7 is connected to one end of the sixth resistor R6; the other end of the sixth resistor R6 is connected with one end of the eighth resistor R8 through the seventh resistor R7, and the connection point of the sixth resistor R6 and the seventh resistor R7 is grounded through the eighth capacitor C8; the other end of the eighth resistor R8 is connected to one end of the fourth inductor L4, and the other end of the fourth inductor L4 is a signal output terminal.

The utility model discloses mainly be to L wave band power amplifier circuit's general demand, provide a simple structure's amplifier circuit, this circuit has adopted 2 power amplifier tubes to constitute 2 grades of amplifier circuit, under the prerequisite that satisfies L wave band demand, realizes reduce cost's purpose.

Further, the first power amplifier tube and the second power amplifier tube are LDMOS.

The LDMOS is a commonly used power amplifier in a radio frequency circuit, and along with the progress of semiconductor technology, the LDMOS is adopted to carry out power amplification in the application range of an L wave band to meet the requirement.

The utility model has the advantages that: compare in traditional structure, the utility model discloses a circuit structure is simple, and the cost is lower, is applicable to the application demand of generality.

Drawings

Fig. 1 is a schematic diagram of the circuit logic structure of the present invention.

Detailed Description

The utility model discloses a scheme is for the power amplification demand of L wave band, do not occupy more area and the general condition of performance demand at the circuit wholly, the low-cost realization method that proposes, as shown in fig. 1, including first resistance R1, second resistance R2, third resistance R3, fourth resistance R4, fifth resistance R5, sixth resistance R6, seventh resistance R7, eighth resistance R8, first electric capacity C1, second electric capacity C2, third electric capacity C3, fourth electric capacity C4, fifth electric capacity C5, sixth electric capacity C6, seventh electric capacity C7, eighth electric capacity C8, first inductance L1, second inductance L2, third inductance L3, fourth inductance L4, first power amplifier tube and second power amplifier tube; one end of the first inductor L1 is connected with an input signal, the other end of the first inductor L1 is connected with one end of a first capacitor C1 through a first resistor R1, the other end of the first capacitor C1 is connected with the grid of a first power amplifier tube, and the connection point of the first capacitor C1 and the grid of the first power amplifier tube is grounded through a second resistor R2; the grid of the first power amplifier tube is connected with one end of a second inductor L2, the other end of the second inductor L2 is connected with a power supply, and the other end of the first inductor L2 is grounded through a second capacitor C2; the source electrode of the first power amplifier tube is grounded through a third resistor R3 and a fifth capacitor C5 which are connected in parallel; the drain of the first power amplifier tube is connected with one end of a third inductor L3, the other end of the third inductor L3 is connected with a power supply, and the other end of the third inductor L3 is grounded through a third capacitor C3; the drain electrode of the first power amplification tube is connected with the grid electrode of the second power amplification tube through a fourth capacitor C4, and the connection point of the fourth capacitor C4 and the grid electrode of the second power amplification tube is grounded through a fourth resistor R4; the source electrode of the second power amplifier tube is grounded through a fifth resistor R5 and a sixth capacitor C6 which are connected in parallel; the drain of the second power amplifier tube is connected to one end of the third inductor L3 and one end of the seventh capacitor C7, and the other end of the seventh capacitor C7 is connected to one end of the sixth resistor R6; the other end of the sixth resistor R6 is connected with one end of the eighth resistor R8 through the seventh resistor R7, and the connection point of the sixth resistor R6 and the seventh resistor R7 is grounded through the eighth capacitor C8; the other end of the eighth resistor R8 is connected to one end of the fourth inductor L4, and the other end of the fourth inductor L4 is a signal output terminal.

The utility model discloses an in the scheme, provide impedance match for input signal by first inductance L1 and first resistance R1 of establishing ties, first inductance L1's effect can be understood as enlargies first resistance R1's matching ability, make debugging among the practical application become easier, second resistance R2 and first electric capacity C1 constitute high pass filter, with the low frequency signal filtering, first power amplifier tube is first order amplification, the feed network that comprises second electric capacity C2 and second inductance L2 is the grid feed of first power amplifier tube, the output of first power amplifier tube arrives second power amplifier tube behind the fourth electric capacity, the effect of fourth electric capacity is the high frequency interference who prevents between the two-stage amplifier circuit, fourth resistance R4 parallelly connected with fourth electric capacity C4 is for the second power amplifier tube provides load impedance. The feed network composed of the third capacitor C3 and the third inductor L3 feeds the drain of the power amplifier tube, and a voltage reduction circuit is provided at the source end to ensure the stability of the power amplifier tube. After the interference of the signal output by the second power amplifier tube is filtered by the seventh capacitor C7, the signal passes through the high-pass filter composed of the sixth resistor R6 and the eighth capacitor C8, and finally passes through the output matching circuit composed of the seventh resistor R7, the eighth resistor R8 and the fourth inductor L4, and finally the radio frequency signal amplified by the 2-stage is output.

According to the above technical scheme can obtain, the utility model discloses a circuit structure is simple, and is different with the circuit design who generally only gives roughly the frame, the utility model discloses contained the whole basic components that realize the purpose, can obtain from this, in practical application the utility model discloses an electronic components is less, and the device that the cost is the highest is 2 LDMOS amplifier tubes, and consequently the cost is lower, can satisfy general application performance demand simultaneously, the low-cost product of being convenient for uses.

Claims (2)

1. A power amplifying circuit for an L waveband is characterized by comprising a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a first power amplifier tube and a second power amplifier tube; one end of the first inductor L1 is connected with an input signal, the other end of the first inductor L1 is connected with one end of a first capacitor C1 through a first resistor R1, the other end of the first capacitor C1 is connected with the grid of a first power amplifier tube, and the connection point of the first capacitor C1 and the grid of the first power amplifier tube is grounded through a second resistor R2; the grid of the first power amplifier tube is connected with one end of a second inductor L2, the other end of the second inductor L2 is connected with a power supply, and the other end of the first inductor L2 is grounded through a second capacitor C2; the source electrode of the first power amplifier tube is grounded through a third resistor R3 and a fifth capacitor C5 which are connected in parallel; the drain of the first power amplifier tube is connected with one end of a third inductor L3, the other end of the third inductor L3 is connected with a power supply, and the other end of the third inductor L3 is grounded through a third capacitor C3; the drain electrode of the first power amplification tube is connected with the grid electrode of the second power amplification tube through a fourth capacitor C4, and the connection point of the fourth capacitor C4 and the grid electrode of the second power amplification tube is grounded through a fourth resistor R4; the source electrode of the second power amplifier tube is grounded through a fifth resistor R5 and a sixth capacitor C6 which are connected in parallel; the drain of the second power amplifier tube is connected to one end of the third inductor L3 and one end of the seventh capacitor C7, and the other end of the seventh capacitor C7 is connected to one end of the sixth resistor R6; the other end of the sixth resistor R6 is connected with one end of the eighth resistor R8 through the seventh resistor R7, and the connection point of the sixth resistor R6 and the seventh resistor R7 is grounded through the eighth capacitor C8; the other end of the eighth resistor R8 is connected to one end of the fourth inductor L4, and the other end of the fourth inductor L4 is a signal output terminal.

2. The power amplifier circuit as claimed in claim 1, wherein the first and second power amplifiers are LDMOS transistors.

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