An RFIC includes a transmit acoustic transducer, a digital conversion
module, a transmit baseband module, an analog conversion module, an
up-conversion module, a power amplifier circuit, a low noise amplifier
circuit, a down-conversion module, a receive baseband processing module,
and a receive acoustic transducer circuit. The transmit acoustic
transducer circuit converts transmit sound waves into transmit electrical
signals. The digital conversion module converts the transmit electrical
signals into digital transmit audio signals and converts down-converted
signals into digital receive baseband or low IF signals. The transmit
baseband processing module converts the digital transmit audio signals
into digital transmit baseband or low IF signals. The analog conversion
module converts the digital transmit baseband or low IF signals into
analog transmit baseband or low IF signals and converts digital receive
audio signals into receive electrical signals. The up-conversion module
converts the analog transmit baseband or low IF signals into up-converted
signals. The power amplifier circuit amplifies the up-converted signals.
The low noise amplifier circuit amplifies receive RF signals. The
down-conversion module converts the amplified receive RF signals into the
down-converted signals. The receive baseband processing module converts
the digital receive baseband or low IF signals into the digital receive
audio signals. The receive acoustic transducer circuit converts the
receive electrical signals into receive sound waves.