摘要:
An integrated circuit has a clock subsystem, and a circuit. The clock subsystem is configured to provide a reference clock signal to a first module and a second module. The circuit is configured to distribute information describing characteristics of the reference clock signal to the second module. The information distributed with the circuit enables the second module to adapt the reference clock signal based on the information.
摘要:
An electronic device is equipped with an oscillator interface to be coupled to an oscillator crystal of an oscillator element. The electronic device includes an oscillator circuit which is coupled to the oscillator interface and generates an oscillator signal. The electronic device is further provided with a temperature measurement interface to be coupled to a temperature sensor of the oscillator element so as to receive the temperature signal. For accomplishing temperature compensation, the electronic device is provided with a measurement controller coupled to the measurement interface and configured to measure a first value of the temperature signal at a first point of time and a second value of the temperature signal at a second point of time. A frequency drift estimator is provided so as to estimate a frequency drift of the oscillator signal on the basis of the first value of the temperature signal and a second value of the temperature signal. By means of a compensation logic, a frequency compensation signal for the oscillator circuit is generated on the basis of the estimated frequency drift.
摘要:
A method and system of a GPS system controlling a voltage of an input signal to an oscillator, the oscillator producing a clock reference signal to the GPS system and a modem system, such that a frequency of the clock reference signal is altered to synchronize the modem system with a corresponding network while the GPS system remains in a locked state.
摘要:
In a method for qualification of the transmission quality of a frequency channel in a wire-free communication system that has two or more frequency channels, units in the system communicate via the frequency channels. Data is transmitted in time slots in a time pattern using a time slot method. The influence of possible interference sources is determined in a measurement time slot in which no data is received, in that the field strength is measured at the frequencies of two or more frequency channels, and the field strength information is used for qualification decisions relating to the frequency channels.
摘要:
The present invention relates to a receiving apparatus for a mobile communications system which can be modulated using different modulation types at the transmitter end. According to one embodiment of the invention, in the middle of a data burst of a Bluetooth communications system, a GFSK modulation method is switched to an M-DPSK modulation method, which is used for the payload data. A frequency offset estimation unit is provided for GFSK-modulated signals in a first receiving section and estimates the frequency offset by averaging over a bit sequence of a trailer of a data burst. The frequency offset is corrected in a second receiving section, by means of a frequency correction unit which operates on the basis of the CORDIC algorithm.
摘要:
An optoelectronic sensor includes at least one light transmitter for the transmission of light signals into a monitored zone, at least one light receiver for the reception of light signals transmitted from the light transmitter and a control device for the generation and/or influencing of the light signals and for the generation of an object detection signal in the case of the presence of an object in the monitored region in dependence on the output signals of the light receiver. In this connection, the light signals transmitted into the monitored zone by the light transmitter are each generated by an output signal modulated in accordance with the spread spectrum method using a random pseudo-noise code.
摘要:
Apparatus (20) having two devices (21, 22) which can be connected to one another via an interface (23, 24), where the devices (21, 22) each have an activation unit which, upon receipt of a control signal at a control input, prompts the respective device (21, 22) to change over from a standby mode to an active mode, and where the control signal is transmitted by the respective other device (21, 22), and the control input in one device (21) is an interface connection and, in the other device (22), is located outside the interface (23, 24).
摘要:
The invention is directed to a receiver arrangement, for example, in a mobile radio, which allows the use of slowly locking phase locked loops for a point-to-point connection between two transceivers, even in the case of a heterodyne receiver structure. The need to change channels between a transmission slot and a reception slot is avoided by virtue of a changeover device being provided for the purpose of interchanging the in-phase and quadrature components at the input side on a down-conversion frequency mixer. This advantageously allows either the upper sideband or the lower sideband of a useful signal to be down-converted without the need to change channel.
摘要:
The invention relates to a demodulator and also a demodulation method and enables a reliable demodulation even when the intermediate frequency range overlaps the range of the data frequencies of the signal. For this purpose, a rapidly oscillating output signal is generated from the in-phase signal and also the quadrature signal, the sign of which output signal varies in a manner dependent on the product of the signs of the in-phase signal and of the quadrature signal. Either an XOR gate or a multiplier stage may be used in order to generate an output signal of this type.
摘要:
A method for calculating the power consumption of a mobile device, particularly of a mobile station of a mobile radio system, in an observation period Δt based on various possible system states sk in which the device can be in the period Δt. A value of a quantity Δk is determined system-state-dependently for the system states sk occurring in the period Δt. The power consumption in the period Δt is calculated in such a manner that the quantities Δk and state-dependent typical currents ik are taken into consideration.
摘要翻译:一种用于在观察期间Deltat中基于移动无线电系统的移动台的功耗来计算功耗的方法,该方法基于该设备可以在其中的各种可能的系统状态 期间Deltat。 对于在时间段Deltat中发生的系统状态,系统状态地确定数量Delta N k的值。 以这样的方式计算期间Deltat中的功率消耗,即考虑到数量Delta>和状态相关的典型电流i k k。