Triple band receiving apparatus for a mobile communication terminal
First Claim
1. A tri-band receiving terminal of a mobile communications system, comprising:
- a filter unit which filters signals in each of three frequency bands;
a dual-band radio frequency (RF) receiver including first and second inputs, which respectively receive first and second signals;
a switching unit disposed on an exterior of the dual-band RF receiver and having an output connected to the second input of the dual-band RF receiver, and having a first input for receiving a first-band signal and a second input for receiving a second-band signal and which switches between selection of the first-band signal and the second-band signal, the second-band signal being of a different frequency than the first-band signal, wherein the switching unit switches between selection of the first-band signal and the second-band signal based on a band select signal; and
an impedance-matching unit including a first matching unit connected to the first input of the switching unit and a second matching unit connected to the second input of the switching unit, and which adjusts an impedance mismatch before the second input of the RF receiver caused by the switching unit, wherein the dual-band RF receiver receives a third-band signal at the first input of the dual-band RF receiver, the third-band signal being of a different frequency than the first-band signal and the second-band signal.
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Accused Products
Abstract
A triple band receiving terminal of a mobile communication system operates in three bands by installing an impedance matching unit and a band selection switching unit at the exterior of a dual band RF receiver. The triple band receiving terminal includes three filters for passing signals corresponding to three different bands, an impedance matching unit for matching impedance of signals passing the second and the third filters, and a RF (radio frequency) receiver for processing a signal inputted from the first filter and the switching unit as an intermediate frequency. Accordingly, by simplifying and minimizing the size of the construction of an internal circuit, a mobile communication terminal can be efficiently small size and light-weighed
27 Citations
24 Claims
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1. A tri-band receiving terminal of a mobile communications system, comprising:
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a filter unit which filters signals in each of three frequency bands; a dual-band radio frequency (RF) receiver including first and second inputs, which respectively receive first and second signals; a switching unit disposed on an exterior of the dual-band RF receiver and having an output connected to the second input of the dual-band RF receiver, and having a first input for receiving a first-band signal and a second input for receiving a second-band signal and which switches between selection of the first-band signal and the second-band signal, the second-band signal being of a different frequency than the first-band signal, wherein the switching unit switches between selection of the first-band signal and the second-band signal based on a band select signal; and an impedance-matching unit including a first matching unit connected to the first input of the switching unit and a second matching unit connected to the second input of the switching unit, and which adjusts an impedance mismatch before the second input of the RF receiver caused by the switching unit, wherein the dual-band RF receiver receives a third-band signal at the first input of the dual-band RF receiver, the third-band signal being of a different frequency than the first-band signal and the second-band signal. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for a triple band receiving terminal of a mobile communication system, comprising:
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a first filter for passing signals corresponding to a first band; a second filter for passing signals corresponding to a second band; a third filter for passing signals corresponding to a third band; a dual-band radio frequency (RF) receiver including a first input and a second input for respectively receiving first and second signals; a switching unit having first and second inputs for respectively receiving two of the three band-filtered signals and having an output connected to the second input of the dual-band RF receiver for outputting one of the two band-filtered signals based on a control signal, wherein the switching unit outputs a first-band signal or a second-band signal based on a band select signal; and an impedance-matching unit including a first matching unit connected to the first input of the switching unit and a second matching unit connected to the second input of the switching unit, and which adjusts an impedance mismatch before the second input of the RF receiver caused by the switching unit, wherein the dual-band RF receiver receives a third-band signal at the first input of the dual-band RF receiver, the third-band signal being of a different frequency than the first-band signal and the second-band signal. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. An apparatus for a triple band receiving terminal of a mobile communication system, comprising:
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a first, a second, and a third filter for filtering signals in a first, a second and a third band; a first and a second matching unit for impedance-matching the signals passing through the second and the third filters; a switching unit for selectively connecting to the first or the second matching unit;
a first and a second low noise amplifier for amplifying signals inputted from the first filter and the switching unit at a predetermined level;a first and a second phase shifter for phase-modulating an oscillation frequency outputted from a local oscillator; a first and a second mixer for mixing an output signal of the first low noise amplifier with the oscillation frequency outputted from the first phase shifter; and a third and a fourth mixer for mixing an output signal of the second low noise amplifier with the oscillation frequency outputted from the second phase shifter, wherein the first and second matching units are disposed between the second and third filters and the switching unit and adjust an impedance mismatch at the second low noise amplifier caused by the switching unit, wherein the first and second low noise amplifiers, the first and second phase shifters, the first and second receivers and the third and fourth mixers comprise a dual-band receiver constructed as a single unit, and wherein the switching unit, the first and second matching units and the first, second and third filters are constructed on an exterior of the dual-band receiver so as to form the triple band receiving terminal. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A signal processor in a mobile communications system, comprising:
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a first impedance-matching unit which matches an impedance of a signal received within a first frequency band; a second impedance-matching unit which matches an impedance of a signal received within a second frequency band, the second frequency band being a different frequency band than the first frequency band; a switching unit which selects a signal output from one of the first impedance-matching unit and the second impedance-matching unit; a dual-band radio frequency (RF) receiver including first and second inputs, which respectively receive first and second signals, the dual-band RF receiver receiving the selected signal from the switching unit at the second input and receiving a signal corresponding to a third frequency band at the first input, the third frequency band being a different frequency band than the first frequency band and the second frequency band; a first filter which filters signals within the first frequency band; and a second filter which filters signals within the second frequency band, said first filter and said second filter respectively connected to inputs of the first impedance-matching unit and the second impedance-matching unit, wherein the first and second impedance-matching units are disposed between the first and second filters and the switching unit and the first and second impedance-matching units adjust an impedance mismatch at the second input of the dual-band RF receiver caused by the switching unit. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification