Abstract
This paper presents a Ku-band monolithic multifunction transmitter and receiver chipset fabricated in 0.25-μm GaAs pseudomorphic high-electron mobility transistor technology. The chipset achieves a high level of integration, including a 4-bit 360° digital phase shifter, 5-bit 15.5-dB digital attenuator, amplifier and 9-bit digital serial-to-parallel converter for digital circuit control. Since the multifunction chipset includes a medium power amplifier and a low-noise amplifier, it features high P1dB and low noise figures over the full Ku-band frequencies. The multifunction transmitter shows a peak gain of 16.5 dB with output P1dB of 19.2 dBm at 15 GHz. The multifunction receiver shows a peak gain of 17.3 dB with noise figure of 2.5 dB at 15 GHz. The attenuation range is 15.5 dB with a step of 0.5 dB and the phase shift range is 360° with a step of 22.5°. Each chip area of the transmitter and receiver is 4.2 × 2.8 mm2.
Highlights
Demand for phased-array systems has continued to increase for satellite/military communications and radars [1]
The multifunction receiver is composed of an low-noise amplifier (LNA), 4-bit digital phase shifter, 5-bit digital attenuator and 9-bit serial-to-parallel converter (SPC)
It consists of a 9-bit shift register, nine latches, three input voltage transformers (IVT) for serial data input (Din), clock (CLK), enable (EN), nine output voltage transformers (OVT) for control of the attenuator and phase shifter and one OVT for serial data output (Dout)
Summary
Demand for phased-array systems has continued to increase for satellite/military communications and radars [1]. A multifunction chip integrates most of the functionalities required for the array element in a single chip, including the phase and amplitude control, signal amplification and digital control This significantly reduces the system complexity and cost [3]. It is more attractive to use GaAs technology for broadband multifunction chips with high gain, high output power and low noise figures. Other reports show narrowband a phase shifter, attenuator, amplifier and digital control circuit [1,8,9]. This paper, a GaAs multifunction transmitter receiver chipset operating theKufull. InInthis paper, a GaAs multifunction transmitter andand receiver chipset operating over over the full. The multifunction receiver is composed of an LNA, 4-bit digital phase shifter, 5-bit digital attenuator and 9-bit SPC. 15.5-dB attenuation and 360° phase shift are implemented in the receiver and are controlled by the SPC.
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