DESIGN AND DEVELOPMENT OF HIGH POWER AMPLIFIER AT 3.4GHz

Neel Patel (140320705506)

Guided by: Asst. Prof. Nimesh M Prabhakar

L.J. Institute of Engineering and Technology

INTRODUCTION OF IRNSS

MATCHING NETWORK DESIGN

REFERENCES

HARMONIC BALANCE IN ADS

• Due to this output signal contains fundamental

frequency components and some undesired frequency

components, which are integral multiple of input signal

frequency. These additional frequency components are

called harmonics. Hence the output is said to be

distorted, this is called harmonic distortion.

1st Order Harmonic

f1=3GHz

f2=4GHz

3rd Order Harmonic

2f1-f2=2GHz

2f2-f1=5GHz

5th Order harmonic

3f1-2f2=100 MHz

3f2-2f1=6GHz

CONCLUTION

• In a communication satellite serving the earth, the

transponder transforms the received signals into

forms appropriate for the transmission from space

to earth. The transponder may be simply a repeater

that amplifies and frequency signals. In this paper,

the technologies of the major transponder elements

are presented and amplifying devices.

• The transmitter is required to amplify the wanted

signal without distortions and without other

impairments which would decrease the usefulness

of the signal. Two types of amplifiers (transmitters)

are in common use, electron beam devices

(commonly TWTAs) and solid state power

amplifiers (SSPAs). For the TWTAs, the electrical

power supply is often required to supply a number

of high voltages , which presents a series of

technology and design challenges. show in fig 1.

The Power Amplifier presented here does meet many of the

required specifications. The transistor is Stable for design

specifications.The choice of transistor in this power amplifier has

influenced the design specifications in an unexpected manner.

To make a power amplifier utilizing this device, a wide variety of

matching networks should be explored along with an

appropriate device modelling in ADS. Also Complete the

Impedance Matching , Biasing Network , Harmonics Balance.

RANGING

TRANSPONDER

MASTER

CONTROL

STATION

DIPLEXER RECEIVER BPF TRANSMITER

(PA)ANTENNA

CDMA

6.7 GHz

3.4 GHz

Fig 1: Indian Regional Navigational Satellite System

DESIGN APPROACH

• The wireless communications in satellite transponder

increasing demands on systems designs.

• A critical element in Radio Frequency (RF) front ends

is the Power Amplifier (PA). Main specifications for PA

design include high linearity, better gain and

efficiency.

• The active device specified for this design was a

Rfmd SZA3044Z BJT. Table I shows the performance

specifications for the designed Power amplifier..

Parameter Symbol Specification

Frequency range fo 2.5-4.5 GHz

Gain S21 ≥15dB

Input return loss S11 ≤ -10dB

Output return loss S22 ≤ -10dB

Input/output

Impedance

Z0 50Ω

Output power P0 1W

Table 2 : Target Specification

• Impedance matching is required to maximize the power

transfer and minimize the reflections. Smith chart is

used for impedance matching. According to maximum

power transfer theorem, maximum power delivered to

the load when the impedance of load is equal to the

complex conjugate of the impedance of source (ZS=ZL*).

A. INPUT MATCHING NETWORK

• The first set of measurements we are taken for S11 with

the device mounted on the board and biased, but

without matching networks. These measurements were

de-embedded in ADS to obtain the input impedance at

the device terminal.

B. OUTPUT MATCHING NETWORK

• To design the output matching network, S22 of the

biased, unmatched system was measured and de-

embedded back to the device terminals. Simulations

were then performed to determine the impedance

presented to the drain that would maximize small signal

gain. The matching network was designed in the same

fashion as the input matching network.

Fig 2: Input & Output Matching Network Circuit In ADS

DC I/V CHARACTRISTICS

• We have to define the Output Power and Power

Efficiency of the Amplifier with the help of the DC IV

Characteristics.

• The Biasing condition Vce = 5V , Idc = 240 mA

• Result:

RF Output Power: 1.33W

DC Power Output: 2.47W

Efficiency=𝑅𝐹𝑂𝑢𝑡𝑝𝑢𝑡 𝑃𝑜𝑤𝑒𝑟

𝐷𝐶 𝑜𝑢𝑡𝑝𝑢𝑡 𝑃𝑜𝑤𝑒𝑟∗ 100%

=1.33𝑊

2.47𝑊*100%

=54%

Fig 5: Stability Factor

Fig 6 : Harmonic balance

Fig 9 : Harmonic Balance

Fig 7 : OrdersFig 8 : 1st & 3rd Order Output

RESULTS

Parameter Specification Measured

results

After

Impedance

Matching

Measure

d results

After

Biasing

Network

Gain S21 ≥15dB 26.412dB 27.064dB

Input return

lossS11 ≤ -10dB -39.873dB -

15.440dB

Output

return lossS22 ≤ -10dB -49.342dB -

15.725dB

Input/output

ImpedanceZ0 50Ω 50Ω 50Ω

Table 3 : Measurement Results

BIASING NETWORK OF POWER AMPLIFIER

Fig 4 : Gain Of Power Amplifier

Fig 3 : After Biasing Network Of Power Amplifier

Fig 5: Stability Factor

• The power amplifier (PA), being one of the most

important blocks of the wireless communication

system, is no exception. Therefore, this document

presents a detailed study of the single-ended class-

A power amplifier, which is the configuration that

has good efficiency and easier integration, making it

one of the strongest candidates for a practical

implementation. The aim of this work is to provide

the study that guides the design of a high power

amplifier at 3.4 GHz for Ranging Transponder

applications.

ABSTRACT

LITERATURE SURVEY

Rf

No

Frequency Gain

(S21)

S11 S22 Efficiency

1 3.5GHz 33dB -10dB -10dB 30%

2 0.2 – 8GHz 13.2d

B

-9.1dB -12dB 39%

3 3.4GHz 14dB -10dB -10dB 25%

4 3.5GHz 16dB -30dB -31dB 45%

5 5.8GHz 9dB -19dB -19dB 50%

Table 1 : Literature Survey

1. Tomohiro Senju, Takashi Asano, Hiroshi Ishimura Microwave Solid-state Department “A

VERY SMALL 3.5 GHz 1 W MMIC POWER AMPLIFIER WITH DIE SIZE REDUCTION

TECHNOLOGIES” Komukai Operations Toshiba Corporation, Toshiba-cho, Saiwai-ku,

Kawasaki 2 12-858 1, Japan-2001 IEEE, pp. 070-073 ,ISBN:0-7803-7161-5/01.

2. Kevin W. Kobayashi, YaoChung Chen, Ioulia Smorchkova, Roger Tsai,Mike Wojtowicz,

and Aaron Oki “A 2 Watt, Sub-dB Noise Figure GaN MMIC LNA-PA Amplifier with Multi-

octave Bandwidth from 0.2-8 GHz” 2007 IEEE - SIRENZA MICRODEVICES, pp.619 -

622,ISBN:1-4244-0688-9/07.

3. Paul saad, christian fager, hossein mashad nemati, haiying cao, herbert zirath and

kristoffer andersson ” A highly efficient 3.5 GHz inverse class-F GaN HEMT power

amplifier” European Microwave Association International Journal of Microwave and

Wireless Technologies, 2010, 2(3-4), pp.317–332,DOI:10.1017.