Amplifier structure and amplification method thereof
View Patent ↗Provided is an amplifier structure. The amplifier structure includes a delta-sigma modulator, an up converter, a power amplifier, and a band-pass filter. The delta-sigma modulator receives an IF signal to delta-sigma modulate the IF signal. The up converter up-converts a frequency of the delta-sigma modulated signal with an LO signal. The power amplifier amplifies a power of the up-converted signal. The band-pass filter filters the amplified signal of a selected band. The amplifier structure performs the delta-sigma modulation operation on an IF input signal, and thus can considerably decrease a delta-sigma modulation operation speed compared to a typical amplifier structure and moderate the specification in implementing a power amplifier.
1. An amplifier structure comprising:
a delta-sigma modulator receiving an Intermediate Frequency (IF) signal to delta-sigma modulate the IF signal;
an up converter up-converting a frequency of the delta-sigma modulated signal using a Local Oscillator (LO) signal;
a power amplifier amplifying a power of the up-converted signal;
a band-pass filter filtering the amplified signal of a selected band; and
an LO signal generator generating the LO signal,
wherein the LO signal generator outputs k number of pulse pairs (where k is an integer) in synchronization with a delta-sigma modulation operation of the delta-sigma modulator.
2. An amplifier structure comprising:
a delta-sigma modulator receiving an Intermediate Frequency (IF) signal to delta-sigma modulate the IF signal;
an up converter up-converting a frequency of the delta-sigma modulated signal using a Local Oscillator (LO) signal;
a power amplifier amplifying a power of the up-converted signal; and
a band-pass filter filtering the amplified signal of a selected band,
wherein a power amplification efficiency and implementability are controlled by selecting the up-converted Radio Frequency (RF) as “kfs+fc” or “kfs−fc”,
the fs is a delta-sigma modulation speed, and
the fc is an IF.
3. An amplification method of an amplifier structure, the amplification method comprising:
delta-sigma modulating an Intermediate Frequency (IF) signal;
up-converting the delta-sigma modulated signal into a signal of a Radio Frequency (RF) using a Local Oscillator (LO) signal;
amplifying a power of the up-converted signal;
filtering the amplified signal of a selected band; and
selecting high-side injection with a frequency of the LO signal higher than the RF, or selecting low-side injection with a frequency of the LO signal lower than the RF.
4. The amplification method of claim 3 , further comprising generating the LO signal at an integer multiple of a delta-sigma modulation speed in synchronization with the delta-sigma modulation speed.