Abstract:
Apparatus and method to reduce signal amplitude peak-to-average ratio (PAR) in a wireless communications system are described. The apparatus may include a signal conditioning module (112) to receive a baseband signal. The signal conditioning module (112) may split the baseband signal along multiple paths (114,116), delay one or more of the paths, and combine the multiple paths (114,116) to form a conditioned signal (132) having lower signal amplitude PAR than the baseband signal.
Abstract:
An apparatus and method for transmitting signal, the apparatus comprising a front end telecommunications module (100) including a power amplifier (106, 108), a matching circuit (110, 112) coupled to the power amplifier (106, 108), and a filter (114, 118) coupled to the matching circuit (110, 112), such that a signal received by the power amplifier (106, 108) is transmitted to the filter through the matching circuit (110, 112). The telecommunications module (100) provides quad-band capability in a compact design.
Abstract:
A microphone unit comprising a voice input for receiving (22) a voice input signal, an analog to digital converter for creating (26) a digital signal from voice signal, a voice coding device for creating (28) a voice coded signal output from the digital signal, encryption means for encrypting (30) the voice coded signal, and a modulator for generating (32) a transmittable signal that can be supplied (34) to a radio via the microphone input. Additionally, the microphone unit is capable of performing the steps in reverse upon receiving an encrypted signal. The received signal output from the radio is demodulated, un-encrypted, voice decoded, converted from a digital voice signal to an analog voice signal, and output via a speaker which is preferably built into the microphone unit.
Abstract:
A wireless communication network (50) is provided that includes a plurality of access points. A plurality of the access points are configured as local access points (52) that are each configured to operate at one of a set of frequencies and within a communication range. The local access points (52) may communicate with a mobile device within the corresponding local access point communication range. The wireless network (50) further includes an access point configured as a master access point (62) to communicate with each of the plurality of local access points (52) at a frequency that is outside the set of frequencies of the local access points.
Abstract:
A serial controller for use in controlling various radio frequency (RF) modules (218, 220, 222, 224) within an RF integrated circuit is coupled to an serial bus (102) that, internal to the RF integrated circuit transmits commands and data from a microcontroller to a data receiver module within the serial controller. The serial commands and data are transmitted across the serial bus (102) in a data packet format having an address-overhead portion and a data portion, wherein the data receiver module removes the address-overhead bits from the packet and provides the data portion of the packet as output data. A decoder/coder logic module coupled to the data receiver receives the serial data and is operative to process the serial data and in response thereto activate one or more control signals (210, 212, 214, 216). The RF module (218, 220, 222, 224) includes at least one circuit and one or more switching elements that are coupled to the one or more control signals (210, 212, 214, 216). The switching elements are responsive to the corresponding control signals (210, 212, 214, 216) by switching one or more switchable component into the circuit or isolating the switchable component from the circuit to adjust or change one or more parameter of the circuit so as to vary the output of the RF module in a controlled manner.
Abstract:
The invention is a dual band power amplifier with a small footprint having excellent band-toband isolation. An improved second and fourth harmonic trap at the output of the low band power amplifier comprises a first capacitance shunted to ground placed in series with an inductance, the inductance preferably in the form of a transmission line of predetermined length, and a second capacitance coupled between an intermediate point of the transmission line inductance and ground. Band-to-band isolation can be additively increased by further forming a ground loop between the outputs of the two power amplifiers. The ground loop further isolates the high band amplifier from the low band amplifier by causing the magnetic fields generated around the output wire bonds of the lower band power amplifier to set up circulating currents primarily in the ground loop, rather than coupling into the output wire bonds of the higher band power amplifier.
Abstract:
Short-range vehicular radar systems are described. In one implementation, an apparatus used in radar applications includes a programmable digital receiver (114) having an adaptable interference filter (216, 218) that is configured to reject radar pulses received from another radar system. In another implementation, a short-range vehicular radar system includes receive and transmission antennae (116(1), 116(2)), a programmable delay generator (201), and programmable receiver (114). The programmable delay generator (201) is configured to control transmission of pulses from the transmission antenna (116(2)) at randomly selected times to prevent ambiguities associated with target objects that are distances away from the transmission antenna (116(2)) that are greater than the speed of light times the pulse repetition rate divided by two. The programmable receiver (114) is calibrated to sample signals received by the receive antenna (116(1)) relative to when the pulses are emitted from the transmission antenna (116(2)).
Abstract:
An integrated circuit package (100) houses an connects to a die to form an integrated circuit (104) with internal matching (106). The package comprises a lead frame comprising at least one transmission line, a die paddle, and at least one input lead and at least one output lead (102). Bond wires connect select locations along the at least one transmission line to ground through impedance matching network (106) associated with at least one of the output leads. The package may also substantially encapsulate the lead frame, while exposing the die paddle and the input/output leads.
Abstract:
A signal transmission apparatus (200) including a first waveguide (205), a second waveguide (207) and a third waveguide (215). The transitions between the first, second and third waveguides are substantially co-impedance matched. The signal transmission apparatus may be a multi-port device, and may be used to transition high frequency signals from one component to another in a variety of applications.
Abstract:
Short-range vehicular radar systems are described. In one implementation, an apparatus used in radar applications includes a programmable digital receiver (114) having an adaptable interference filter (216, 218) that is configured to reject radar pulses received from another radar system. In another implementation, a short-range vehicular radar system includes receive and transmission antennae (116(1), 116(2)), a programmable delay generator (201), and programmable receiver (114). The programmable delay generator (201) is configured to control transmission of pulses from the transmission antenna (116(2)) at randomly selected times to prevent ambiguities associated with target objects that are distances away from the transmission antenna (116(2)) that are greater than the speed of light times the pulse repetition rate divided by two. The programmable receiver (114) is calibrated to sample signals received by the receive antenna (116(1)) relative to when the pulses are emitted from the transmission antenna (116(2)).