CN1075285C - Push-pull power amplifier module for cable TV - Google Patents
Push-pull power amplifier module for cable TV Download PDFInfo
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- CN1075285C CN1075285C CN 94113806 CN94113806A CN1075285C CN 1075285 C CN1075285 C CN 1075285C CN 94113806 CN94113806 CN 94113806 CN 94113806 A CN94113806 A CN 94113806A CN 1075285 C CN1075285 C CN 1075285C
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- push
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Abstract
The present invention relates to a push-pull power amplifying module for a cable television. The push-pull power amplifying module comprises an input matching gain compensating circuit (1), a push push-pull amplifying level (2), an output push-pull amplifying level (3) and an output matching circuit (4), wherein the input matching gain compensating circuit (1) is composed of capacitors (C1) and (C2), resistors (R1) and (R2) and an inductor (L1). Active elements (M1), (M2), (M3) and (M4) are microwave monolithic integrated circuits. Output ends of the active elements are respectively connected with a direct current feed circuit in series, and the direct current feed circuit is composed of resistors and capacitors. The output matching circuit is composed of phi-type matching networks (R25), (C17), (L2), (C18) and (C19). The parts are respectively coupled by transformers (T1), (T2) and (T3).
Description
The present invention relates to the cable TV amplifier, specifically is a kind of amplification module of recommending.
At present, only having abroad, major company of seldom a few family can produce the cable TV power amplifier module.The MHW series module circuit diagram that Fig. 1 produces for Motorola Inc, circuit board forms on ceramic substrate, by the evaporated metal photoetching making, the transistor bareing chip of active device (Q1)-(Q8) for separating, per two chips are formed one and are sent out-common-base circuit altogether, as sending out the amplifier elementary cell, connect relevant at different levels by the thermocompression bonding spun gold, chipset electrode sintering is on a filled gold plate, to launch hot-fluid, prevent that junction temperature is too high, all resistance in the circuit are by evaporation or sputter resistance film, after photoetching, form square resistance, arriving required resistance value through laser cutting again, is flaky electric capacity (C1)-(C6), and soldering is to circuit board, resistance (R7), (R9) locate the mos capacitance that is formed by silicon chip in parallel, transformer is made by the magnet ring coiling.The major advantage of this generic module is that performance is better, and shortcoming is to adopt semiconductor to do the technology of chip-scale, and it is many to make the element technology type, complex process, cost height, and exist heat radiation bad, problem such as power consumption is bigger.
The objective of the invention is to overcome the deficiency in the prior art, utilize microwave monolithic integrated circuit, design a kind of good heat dissipation, low in energy consumption, technology is simpler, and cost is low, and can realize the push-pull power amplifier module of large-scale production.
The present invention includes input coupling gain compensation circuit (1), amplifying stage (2) is recommended in promotion, amplifying stage (3) is recommended in output, output matching circuit (4) four parts, input coupling gain compensation circuit (1) is by electric capacity (C1), (C2), resistance (R1), (R2), inductance (L1) is formed, electric capacity (C1), resistance (R1), inductance (L1) is a gain compensation circuit, promotion is recommended amplifying stage and output and is recommended and be connected to resistance (R5) in the amplifying stage respectively, (R8), (R9), (R10), (R18), (R19), (R20), (R21), to improve linear characteristic and dynamic range, active device (M1), M2), (M3), (M4) be microwave monolithic integrated circuit, the output of active device has been gone here and there respectively by resistance, electric capacity (R11), (C7); (R12), (C8); (R22), (C14); (R23), (15) direct current tie line of forming, output matching circuit is made up of (R25), (C17), (L2), (C18), (C19) π type matching network, between the each several part respectively by transformer (T1), (T2), (T3) coupling with.
Advantage of the present invention is that module performance is good, and manufacture craft is greatly simplified, and can carry out large-scale production, high conformity, and low in energy consumption, thermal diffusivity is good, and cost is low.
Below in conjunction with accompanying drawing structure of the present invention is further described.
Fig. 1 is a prior art modular circuit structural representation.
Fig. 2 is a modular circuit structural representation of the present invention.
Fig. 3 is a module microwave integrated circuit radiator structure schematic diagram of the present invention.
As shown in Figure 2, modular structure of the present invention is by input coupling gain compensation circuit (1), amplifying stage (2) is recommended in promotion, amplifying stage (3) is recommended in output and output matching circuit (4) is formed, for frequency band is evened up, input adopts by electric capacity (C1), inductance (L1), the gain compensation circuit that resistance (R1) is formed, it is microwave monolithic integrated circuit that the active device (M1)-(M4) that amplifying stage (2) and output recommends in the amplifying stage (3) is recommended in promotion, at the input pickup resistance of recommending amplifying stage (2) (R3), (R4), electric capacity (C5) and resistance (R6), (R7), electric capacity (C6) constitutes T type negative feedback network respectively, improve the flatness of frequency band, (C10) in the amplifying stage (3) recommended in output, (R14), (R15), (C11) be inter-stage auxiliary matched circuit, resistance (R16), (R17) be negative feedback resistor, (C14), (R22) and (C15), (R23) be power supply circuits, resistance, electric capacity (R11), (C7); (R12), (C8); (R22), (C14); (R23), (C15) constitutes direct current tie line respectively, be serially connected in the output of two-stage amplifying circuit active device, to prevent the imbalance between the push-pull cascade, output matching circuit is made up of (R25), (C17), (L2), (C18), (C19) π type matching network, between the each several part circuit by transformer (T1), (T2), (T3) coupling and.The transformer adopting ferrite transformer.For improving the linear characteristic and the dynamic range of active device, recommend and sealed in resistance (R9), (R10), (R20), (R21) in the amplifying stage (3) respectively recommending amplifying stage (2) and output, between base stage and the emitter and resistance (R5), (R8), (R18), (R19) arranged.As Fig. 3 institute formula, under the output of active device (M1)-(M2), be connected with beryllium oxide sheet (B
4O), output terminal electrode is welded on the metal level of beryllium oxide, because the beryllium oxide heat-sinking capability is splendid, and the two E utmost points also can dispel the heat through grounding through hole, near radiator etc., chip (m) junction temperature can be descended significantly, thereby improved the reliability of module effectively below the shell.All resistance, electric capacity are piece-shape type, and the energy mounted on surface is to realize large-scale production, chip plastic encapsulation, reliability raising, circuit board employing printed circuit board (PCB).Its course of work is: defeated input TV signal is after gain compensation and input coupling, level at the beginning of the transformer (T1), to produce two phase differences to the balance transition be 180 ° pumping signal to signal by non-equilibrium, be added on the input of recommending amplifying stage active device (M1), (M2) respectively, amplify after transformer (T2) is coupled to output and recommend amplifying stage, recommend amplification through (M3), (M4), by behind the synthetic power of transformer (T3), output to load port again through matching network.
The microwave monolithic integrated circuit model that active element uses in the accompanying drawing 2 is: MAR-8, and its internal structure is a microwave Darlington circuit, its characteristics are: bandwidth, gain is high, volume is little etc.Add suitable biasing and again after E utmost point string proper resistor, can improve the linearity of antetype device significantly, thereby reach the specification requirement of CATV system.
Claims (5)
1. push-pull power amplifier module for cable TV, comprise input circuit, two-stage cascade is recommended the big and output circuit in discharge road, it is characterized in that input coupling gain compensation circuit (1) is by electric capacity (C1), (C2), resistance (R1), (R2), inductance (L1) is formed, electric capacity (C1), resistance (R1), inductance (L1) is a gain compensation circuit, the input that promotes push-pull cascade (2) is connected to respectively by resistance (R3), (R4), electric capacity (C5) and resistance (R6), (R7), the T type negative feedback network that electric capacity (C6) is formed, promotion is recommended amplifying stage (2) and output and is recommended in the amplifying stage (3) the active device collector electrode and gone here and there resistance (R9) respectively, (R10), (R20), (R21), between base stage and the emitter and resistance (R5) arranged, (R8), (R18), (R19), active device (M1), M2), (M3), (M4) be microwave monolithic integrated circuit, the output of active device has been gone here and there respectively by resistance, electric capacity (R11), (C7); (R12), (C8); (R22), (C14); (R23), (C15) direct current tie line of forming, output matching circuit is made up of (R25), (C17), (L2), (C8), (C19) π type matching network, between the each several part respectively by transformer (T1), (T2), (T3) coupling with.
2. push-pull power amplifier module for cable TV according to claim 1 is characterized in that described electric capacity, electricity group are piece-shape type.
3. push-pull power amplifier module for cable TV according to claim 1, it is characterized in that input that amplifying stage (3) is recommended in output be connected to by electric capacity, electricity group (C10), (R14) respectively and (R15), (C11) inter-stage auxiliary matched electric capacity of forming.
4. push-pull power amplifier module for cable TV according to claim 1 is characterized in that being connected with the beryllium oxide sheet under the output of active device (M1), (M2), (M3), (M4), and emitter is through hole ground connection nearby, below the shell near radiator.
5. push-pull power amplifier module for cable TV according to claim 1 is characterized in that circuit board adopts printed circuit board (PCB).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94113806 CN1075285C (en) | 1994-11-08 | 1994-11-08 | Push-pull power amplifier module for cable TV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94113806 CN1075285C (en) | 1994-11-08 | 1994-11-08 | Push-pull power amplifier module for cable TV |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1116376A CN1116376A (en) | 1996-02-07 |
| CN1075285C true CN1075285C (en) | 2001-11-21 |
Family
ID=5036825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94113806 Expired - Fee Related CN1075285C (en) | 1994-11-08 | 1994-11-08 | Push-pull power amplifier module for cable TV |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1075285C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100733981B1 (en) * | 2005-07-05 | 2007-07-02 | 삼성전자주식회사 | Tuner And Broadcast Processing Apparatus Comprising The Same |
-
1994
- 1994-11-08 CN CN 94113806 patent/CN1075285C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1116376A (en) | 1996-02-07 |
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| C14 | Grant of patent or utility model | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |